Hello, my 8 month old beardie finished her first season 2 weeks ago. In the last week or so, she has become very quiet and lays down all the time. She was progressing very well with her obedience training but has become very unresponsive and won't do the most basic of exercises such as hand touch (I clicker train her). She plays half heartedly and seems to get tired very quickly. She has no signs of discharge etc. Is this typical behaviour after a season.

In short yes.  I call it the moaning minnies.  they come out of it, but you will often find they won't put any 'E' for effort into anything just being rather flat.