My friend is gonna blab about my crush?

i told one of my closest girl friends about my crush bcuz i trusted her but i seriously regret that choice. she's not very good at keeping her mouth shut or being discreet. like she makes weird faces at me whenever my crush enters the room or mouths his name and its so freaking obvious! im not sure if i'll be able to talk to her alone before i see my crush. what do i do? im really scared shes gonna blab.