In the beginning of the chapter a school nurse noticed her hands are cold despite not being sick or room temperature low, this is common during pregnancy when blood flow is diverted to womb so it can support growing fetus, it's probably very close or after (judging by suicide attempt) term to abortion.
It's also implied by her mother knowing about pregnancy and making her to deliver, but father might be angry about it as it most likely was accidental or worse.
Is abortion a murderer? Nah.