There's no way Maya, someone who has lived through thousands of years just to wait for the man she loves, decides to do something that could kill her just a few time loops after knowing Sensei is back.
There are some extraordinary circumstances
First of all Sensei told her he might not survive this reset beforehand. Maya calmed him down, but, you know, Maya. Also, Maya already tried to keep Sensei alive by sex in chapter 2, so it could be delibered sacrifice of her.
At the other hand, Maya also said she thought she would not survive reset (sorry, I am currently to sorrow to find proofs). She also linked that though to her haloween costume, so she might have been entirely sure it is her last chance.