My sister in law has midget size hands; no joke. The M&P series seemed to fit her best. The factory pull is 6.5lbs; I bet she can handle it.
Also in terms of racking a pistol, unless she has a disability my guess is she needs some information on technique. Kathy Jackson, a member here, runs a website called corneredcat.com with lots of helpful tips for women and new shooters that I suggest you check out. I've taught many, many new female shooters and from 8 year olds to 80 year olds and after a little confidence building they'd get it eventually. Decent video here of one technique that works about 90% of the time:
There are others as well and most are explained at Ms. Jackson's site above.