Will My Friend Fit into this Hollister Fleece?

That's sweet of you :) but I think you should go an extra size up. Personality, I'll prefer to get the large and be safe rather then a medium and won't fit. Besides, if it is bigger on her she can wear it longer. And you can just go to the Hollister store and exchange it. Just show them the papers/receipt that you bough it (it should came with the fleece in the box) and they should let you get the next size up. Happy holidays!