Hi sounds like her first season.Is she constantly licking herself down there?
This is a major sign.One way to check her is to gently wipe her bits with a piece of white toliet paper or kitchen towel if there is any discharge at all then she is in season.If this is the case please be very wary of any dogs as they will be so attracted to her.The whole thing will last about 3 weeks.
Her moods will change she will go from being really all over you to wanting to be left alone.
A bit like us girls really
Hope this helps
Sharon,Charley & Melody xx