Fruit bats still have sharp teeth.http://upload.wikimedia.org/wikipedia/c ... usLyd1.png
As far as features go, large eyes and large nose both indicate towards fruit bats.
Fruit bats have very large noses and a great sense of smell, the only thing is they're large in the sense that they have a big snout that gives them a long face like a fox, instead of bulbous.
Large eyes, well... Even things that normally don't have any eyes at all seem to be featuring large eyes in this game, so I guess we can't look at that.
Echolocation isn't definitive, because there's a whole family of fruit bats that have that ability. That goes hand in hand with the large ears. http://en.wikipedia.org/wiki/Egyptian_fruit_bat
The one indication I found that seemed to be the most definitive difference is that the fruit bat group has a claw on their second finger, where microbats do not.
But even this doesn't seem to be of any help, as Laylee doesn't even have a claw on her first finger. Not to mention that she seems to be missing that second finger entirely,