She isn't lame, per se.
So she went to the equine vet today and apparently her stifle was locking up!
Which is weird since it only happens in young horses and she's only ten.
However I was told the Telesis horses[her father is Lenas Telesis] all have stifle issues so I guess it's common among them.
Nevertheless, Heidi got blistered and I'm going to stay off of her for 3 days then I can start light arena work.
In just a few weeks, I'll be rodeoing on her again!