mare behaving silly 3rd day in a row?

[showpony]

Posted earlier in wk about how we went from one of the best sessions we had done followed by silly behaviour the following day with trying to tank off if another horse whinnied - no warning signals, threw couple bucks etc and incredibly difficult to get her to switch off. Roll on yesterday and she was a **** on the lunge - nearly ran herself into the wall couple of times, tried turning in ( never done that before) and then went a bit mad and ended up nearly falling as she was disunited. Finally got about 10 mins of decent work but it was a battle. Today, when girl who helps me with her she threw a bit of a strop with her, bucked etc. This behaviour has come completely out of the blue. Now I know she's young but am a bit worried we've had 3 days in a row of numpty like behaviour.
HELP!!!

 

[piebaldsparkle]

Has she come into season? Mine is always angelic the day before she comes into season, then a goon for a few days (espsecially her 1st couple of the year). The mild few days we have had has brought a few at the yard in.

 

[showpony]

How would I tell if she is in season? ( Numpty question I know)