It's the heat... you've got to cool those ladies off, get the temp down to the 60s.. And extractor would help so if you've got one you should get it working... other than that, a small air conditioner in the room the tent is in would also help... you don't actually have to have the air conditioner in the tent... The bare minimum would be to get some fans going to blow air around them... but this is a heat issue, plain and simple.
Good luck...