Request to talk to the Chief Flight Instructor or better demand a written explanation for your daughter's apparent slow progress.
I have over 2000 hours of dual given and I can tell you from my personal experience that women (seem to) learn flying differently. I am not saying that they are less talented, but any man who's been in a (longer) relationship can tell you that the female logic is just different.
I had female students that were given up on, and they are now flying 777 or 787. They didn't need more time, just a (slightly) different learning approach. In most cases the devil was in the details.
If you receive an email reply that your daughter is slow/insecure etc (all the usual bs excuses) request that she gets an instructor with a different learning approach. You Sir are the parent/customer.