Some offices you apply during the last 30 days but hopefully you live in an area where you can apply duriing the last 45 days. You need to get the 45 days really, which Immigration Office is it?
ok, you're problem might be getting a 12 month extension for a Non-O if you apply and buy a re-entry permit, exit then get back before the Non-O expires to get your 12 months stamped in. Careful planning should allow this though.
"She is over 60" therefore retirement Visa is an option or, as you are working legally in Thailand, a Non-O to visit non-Thai family (over 60 days) residing in Thailand
The 65k monthly deposits need to start before getting the first 12 month extension to have a total of 12 consecutive months when the second extension is applied for