What is important is it fit her hands...and has the controls she wants and likes.
Nothing wrong with a 1911, as long as she learns to use it properly.
Nothing wrong with other single stack guns...( like Sig 239 ) if that is what she wants. But there is a good chance / like many of the ladies in my family, that a single stack is exactly what they like the best because of weight, width, etc..and probably grip angle. A Kimber Tac Pro II model, in 9mm -- 4" barrel, alloy frame -- and a Sig 239 ...are 2 of the guns I have that my granddaughters and some of the other ladies in the family like to shoot the best. I have other 1911's in 9mm, all steel, 5" barrels - that most of them think is too heavy...and they go back to the 4" alloy frame.