The horizontal bars are stress bars. She's now uncomfortable w her situation. Soon she'll get too exhausted to swim away from the male and he could kill her... I always take my females out waaaay before this point to avoid injury. You can always try again later (if there's still a female alive). I don't see the rush? I've had an unsuccessful spawn w two very ready bettas. Inexperienced and young fish may not know what to do even of their body is good go.
Do you want to risk your fish over something that can be put off a week? Heck I'm not throwing in my DT male yet even though he's been conditioning for 2+ weeks and looks active... It's cuz his fins are torn still and the stress of breeding could lead to infection.