Back to basics might help, as in go out with her each time and just wait until she does something and praise her loads and give her something really tasty. It will take patience, I’ve been standing outside with dogs many a night in the freezing cold and rain waiting on them to pee so I can praise them and make a fuss. It can get very frustrating but it is worth the effort I find and after a few days they start to cop on and begin going a bit quicker when they go outside and come looking for their bit of chicken or whatever treat I have that day.
If you are home during the day take her out every couple of hours and just wait for as long as it takes and as soon as she does her business treat and let her back in, she should catch on pretty quickly! Waiting outside is the only way to catch her at the right time for praise.