Would i be wrong to ask for proof before i pay my rent?
Proof of what? That your landlord paid her mortgage? I'm not sure what "wrong to ask" means, and you certainly are free to ask anything you like, but whether or not your landlord has paid her mortgage isn't any of your business.
Also, im not so sure i want to remain in this house that could be foreclosed on at anytime!! Would i be legally able to break my lease due to what has transpired?
Absolutely not. For starters, ANY property "could be foreclosed on at anytime" if the owner doesn't pay the mortgage, so there's nothing unique about your situation. Second, the foreclosure process takes MONTHS (and, in some cases, well over a year), so even if your landlord's mortgage lender had commenced the foreclosure process (which doesn't appear to be the case), you'd have several months' notice AT A MINIMUM. Third, even if a foreclosure and sale occurred, it wouldn't impact you other than to change the payee for your rent. If you have a long term lease, the new owner would take the property subject to your lease. If you're month-to-month, then you can be evicted upon receiving appropriate notice, but that's no different regardless of any foreclosure.