I see almost nobody has actually bothered looking to see what Jessa's Mac laptop is actually
capable of running before spending her money and recommending upgrades. (Dean caught the issues.) For as many Apple propeller-heads posting here, so few even got it remotely right. Paying attention to the hardware is important.
Jessa, given the details you've provided in the OP, you own an
Apple MacBook "Core 2 Duo" 2.1 13" (White-08 - Early 2008 - MB402LL/A* - MacBook4,1 - A1181 - 2242) laptop.
Pre-Installed MacOS: X 10.5.2 (9C2015) Maximum MacOS: X 10.7.5*
Details: *This system can run the last version of OS X 10.7 "Lion" if upgraded to at least 2 GB of RAM. It is not supported booting into 64-bit mode when running Mac OS X 10.6 "Snow Leopard." It does not support "OpenCL" either. Please also note that OS X Lion is not capable of running Mac OS X apps originally written for the PowerPC processor as it does not support the "Rosetta" environment.
The simple truth of the matter is that Apple has EOL'd this laptop as of 2012 and no longer supports software updates on it. Jessa can upgrade it to OSX 10.7.5, but that's it. Unfortunately, Apple no longer does security updates to their older operating systems. They're giving OSX away now, but they're ceasing support and security updates with the prior version the instant the new hotness drops. There are greater concerns here other than just an out of date browser from a security standpoint,
there's a lot of unpatched critical OS level vulnerabilities that only got love in 10.8.x and newer that are still active and exploitable in 10.7.5 and older.
If she
wants to stay with OSX, stay current and most importantly stay secure for everyone's sake (including her own), she has to buy another laptop that can officially run Yosemite. The cheapest refurbished Macbook that can still do that over at Mac of All Trades is the
Apple MacBook 13-inch 2.0GHz Core 2 Duo (Early 2009) MB881LL/A for $249 stock (add on $45 if you want a new battery)... of course, there's no guarantee that the next OSX release in another 11 months couldn't potentially land her right back at square one all over again.
The problem is, the hardware is fine. If it works, there's no reason why it can't be functional and serviceable for most anyone's day to day needs so long as the OS is current and secure. This is a purely Apple non-support issue. Wasting hardware that fell out of favor because the preferred OS got too bloated and the company wanted their customers to upgrade is not frugal, environmentally friendly, or mustachian. The good news is, is that
Ubuntu 14.04 reasonably supports the Macbook4,1 hardware (even if the wiki doesn't reflect it), and the Unity interface is sufficiently OSX-ish to not cause
hugely massive muscle memory fits. The camera is a bit difficult to get operational and the touchpad may need some tweaking on sensitivity, but otherwise installs pretty smoothly with the 64-bit EFI build. If you're willing/able to transition over to a full F/OSS stack for your software (LibreOffice, Firefox/Chromium, etc.) and aren't
deeply entrenched in the iOS devices or don't need desktop support for them, you've got a free upgrade path that isn't too difficult to do on your own. My wife is even running the same Macbook you've got with Ubuntu 14.04 herself. No idiotic RAM and SSD upgrades, just a free OS switch. You can't beat free to fix your problem if it's a viable option. If you're brave enough to try, I'll even offer a bit of help if desired.
Unfortunately, if you want to keep running OSX, a hardware upgrade is inevitable and mandatory. There's far cheaper paths than what's been "recommended" as I pointed out, such as
Mac of All Trades... just be sure and cross-check with
EveryMac.com to ensure it can run the latest OSX build.
If you're willing to go with an alternate OS like Ubuntu (or even Windows), your current laptop should still serve you well with minimal effort until it can no longer be repaired. From that point, look into a refurbished
Lenovo Thinkpad T, X or W series from US Micro.
Apple's laptops aren't even ridiculously priced anymore. There's no other company who has better battery life, better build quality, and runs cooler and more quiet than a Mac. It just doesn't exist. That doesn't come from marketing, it comes from personal experience.
*facepalm*
Be thankful I am a pacifist, as I will refrain from beating you about the head with my Thinkpad X61s and its eight hour battery life as an object lesson on bold sweeping statements about Apple's engineering practices versus the rest of the industry.