I wouldn't be concerned about it, DS1 still has a hernia (he just turned 4) they said to us that it would depend on how bad it was by the time he was 2 years old whether they surgically fixed it or not. It' only about 1cm long now and is always out. It doesn't bother him and the hole is getting smaller as he grows

DS2 also has a bit of a hernia, he's 20 months, and in the last 6ish months has gone from being sticking out to being level with his tummy. This happened after he was constantly walking.

If it isn't causing any issues for her, then I wouldn't worry about it right now.