I have an ADCO Super Thumb that works for me. They have six sizes. I think she would need the ST1. I think I paid about $11 from Midway. I don't remember what the LGS was asking, but not much more.
As for "clip", I have learned to only try to correct someone if I really think it will make a difference. If someone says "Whatever" I usually give up on them unless I feel like ridculing them for some fun.
This is my gun. There are many like her, but this one is mine.
I'm not old. I'm CLASSIC!