Assuming you can -- or can learn to -- tackle decently one-on-one, fullback comes to mind. No one else has to be more comfortable under the high ball.

FULLBACK!!!! All day every day

FULLBACK!

i would say that a small girl with that ability should play as a inside center because you get the ball allot so you need to be able to catch and also wen you get the ball you need to be able to move fast with it to get it away also you don't need to make too many tackles so you don't need to be big.

Like all the others who say you should play fullback or centre, but as you seem to be new to rugby if I were you I'd start out at centre and see if an older fullback would take you under their wing.

if you can tackle then be a centre

fullback or winger