This Shoeless Jane 13" Fastpitch Softball First Base Mitt (1300FPFB) is going to be a first base mitt, so you can only use this glove at first base. The other option with a lot of reviews, the Shoeless Joe Shoeless Jane Fastpitch Series (1300FPBW) is a normal fielders mitt. So the two gloves are going to be pretty different, what she would want is depending on what position she would play.
The best glove for a SS to use will really be dependent on the player's age as well as personal preference. For sizing considerations we would recommend using our glove coach feature:
The right glove to get will always be one of personal preference. With her age, I would recommend going with 12.50 inch pattern. With our 100 day guarantee you can always rest assured that if the glove ends up not being the right fit it can be sent back for an exchange or refund of your purchase price.