Doesn't really sound like EPM to me. Sounds more like she has tied up which in that case you need to make sure she is walked well out before having her stand after working. This way her muscles have plenty of time to cool down and get relaxed again.
Thats what we're thinking Azale. I just can't figure out how she tied up in the first place though, it was so strange! She's in great shape and is generally ridden at a walk on the trails for 2-3, sometimes even 4- hours every week, and this episode started after only walking the trails for 20-30 minutes! I make sure to thoroughly warm her up beforehand as well. We'll definitely be making sure she gets cooled out well after lessons when she starts again though, poor girl!
Kayella- right? XD We got 15 alfalfa-timothy round bales this week for only $175 each! I was so tickled.
And sometimes, there isn't a "reason" that tying up happens. When my guy tied up, I was riding him bareback at a walk. I got off, hosed him off and then tried to walk him away and he wouldn't move. He barely exerted any energy in the ride. He was a barrel horse so a walk around the arena was nothing to him.
But yes, horses that are prone to tying up, definitely need to be cooled out very well before putting them up.