From what I have read I would wait on apping for any type of credit as there is a chance the new tradeline will initially lower your score. On the other hand it may not affect you much if your AAoA (average age of accounts) is substantial. Your scores are high enough that you most likely wouldn't see much of a bump in score if any at all with the new tradeline in the event it was not to hurt you.I would check her score though due to the lender will use the lowest of your median scores if apping together. In the event hers is relatively low I would look into getting her a line of credit started at a local CU or the bank you plan on using as a lender. Get some time of good history and then apply if that is feasible for your timeline. If waiting the full 6 months I would say go for it, maybe someone else can chime in? Hope your experience witg home buying goes well and you picked a good location. I live in Iowa as well, Ottumwa.
Don’t take your credit for granted, use it with care! These days, catch me in the bankruptcy forum!?