you can usually tell by her attitude and body language towards a male. if she is "smiley" torwards the male or giggles/laughs alot. another way to tell is how she touches the male and for how long she does so. 3 or more seconds and you can usually tell she likes you; or even how she puts herself out towards the male like hair flipping or even being closer than the usual "personal bubble".
ask her who she likes
Get to know her.
this is simple get to know this girl
If a guy look at the girl twice then it means she likes the girl
That means he girl likes you and answer that question by telling the girl something she likes to do. If you don't know what the girl likes to do then you're a goner
if she talks to you and touches you on the leg or something like that. then that means she likes you.
I gess the same way you can tell if a normal girl likes you.
Ask her.
ask her out
If no on likes you
go to 'ask' and type in 'how do you know if a girl likes you' you should find all you need there
just ask her if she likes you