Fern is a mystery to me. To do these two sets, she came four

Fern is a mystery to me. To do these two sets, she came four different days. She arrived, smiling, good energy and talkative, we got ready, started to shave her and then it was like she shut down. She changed completely for 15 min and then went back to normal...She did that multiple times and we had to stop several times during the shoot. She couldnt cum either.