Should i ask her out next time im chatting with her, even if its online?

Im pretty sure my crush likes me, like 80% sure, and i wanna ask her out or smth (dont have a plan yet), and i wanna do it as soon as possible. Problem is, we rarely get enough time (more than 5 min), where we are alone, so should i ask her out next time we are alone online? Or should i wait till i get the chance IRL?