IndyGunworks
Grandmaster
If she hasn't shot any guns well, then trying different guns may not be the answer. I would pick one and work with her until she can shoot it well.
Trust me... I am working on it.... Its tuff to explain on the internet, but its not from lack of trying, or instruction. Its more a lack of confidence.... she is so afraid of making a mistake, that trigger time takes a LOOONG time to get through and she way over thinks it. But most guns have not fit her very well either.
This is not a gun for her... this is for my enjoyment plinking at a slower pace and bettering MY skills. Its just a bonus if its something the can handle as well.... The simplicity might make her relax a bit.