Get more quotes.
When I did life insurance, I think I went through SelectQuote, but there are several online places that will do essentially the same thing nowadays.
Usually the quotes they give are assuming a certain very good health level. You're wife's situation probably will result in an increasing quote after they do the underwriting, but the amount of the increase may differ from company to company. A few of the things under your control that increase premiums are smoking status and obesity, so quit smoking and lose weight if either of those apply.
If you want to reduce the cost, you could look into either (a) 20 year policies, and/or (b) decreasing face value policies, because in 20 years - assuming you don't have more kids over the next few years - you'll very likely be self insured. You could also look at $250K policies instead of $300K - I think there is a significant pricing breakpoint at $250K at some insurers.