A mean girl from my school found out i make videos with dolls now shes probly gonna bully me for that.What should i do?

If she does, tell the principal or your parents.

Get reinforcements

When she starts talking about it, be sure to call her a STALKER!,or Who the hell cares u problably play with dolls too u spoiled bitch,but if u dont want to get in more trouble
Just tell the principal that she keeps making fun of u. If none of this works to beat a bully u got to act like one. Do things like call her a slut, drop her things on purpose,or smash her head on a locker or beat the shit out of her.

I think that u should not do anything about it. I am sure that we all have many embarrassing secrets that nobody knows about. Making videos with dolls is not that much of an embarrassing thing. If she does bully u for that, do not react to it. Act as if u are proud of it.................that may work? It is fun to tease someone who reacts to it. It is never fun to tease someone who does not care about it and does not react. So, just do not react. Let your classmates say whatever they want, what do u care? Just ignore them.

This is not that bad.. Seriously. That would blow over in a week or less. You wouldn't need to do anything. People get teased way worse than that.