I use a 15qt for Sammy, It's not that tall. I use a the small size hide for him, once he's about 200 grams I'll switch him over to a custom hide because I heard the medium is way too large, so I recommend getting a small size hide for your little girl until she's about 200 grams. The perfect hide is a dark and really tight one, they feel really secure when they're "snugged" in. I recommend going on www.morphmarket.com best website ever for balls. You have a variety of morphs and breeders to choose from. That's where I got my little Sammy. Also once your little girl is about 500 grams you should switch her over into a 28qt, I believe at 1000 you should switch her over Into a 34qt, then anything 2000+ grams Is a 41qt.

Hope this Info helped!