1. This was not a long post. Actually, MORE details are needed to provide any real help.
2. NO. NO RAMSEY. Dave Ramsey is okay for getting people out of debt if they are terrible with debt. But he is absolute garbage with investing and retirement. He shills for high fee/loaded funds and he's just.... say no to Ramsey for investing/retirement planning, okay?
Your mom first off would need to ask you for help. Do not presume to step in and direct if your help isn't actually wanted. Second, you need real data. HOW MUCH does she actually have, and WHERE is it all located, and WHAT it is invested in (stocks/bonds/annuities - tickers would be great if you can find them).
Your mom needs to also provide things like:
working? Income currently?
expenses? Does she have a real budget that shows actual tracking of all things going out, or is it vauge and sort of just willy-nilly?
will she collect social security? was she married long enough to get social security from her former spouse?
despite her not wanting any of her ex's money, she may be entitled to things like 401ks legally. It's foolish to not take what is rightfully hers and earned as part of being married to a person and splitting their assets and all. Find out if there is anything like this, and then think HARD about turning this down.
So really, we need a budget, expenses, asset breakdown (in detail), debts, and future plans. You may even want to check out
how to do a full case study and get real insight and a good gameplan in place for her.