Birthday party issue

So I'm having a birthday party in November, and onw of my best friends has a party on the same day. Whenever I bring it up she gets all annoyed and says she can't decide what party to go to. I really have to start planning, so I don't know how to ask her...

to decide. What s should I do?

Why cant you have a party together, combining them so your friends don't need to pick and choose.

no, what I mean is that she has another party to go to on the same day, and she can't choose between going to her friends party and mine.

she probably got invited to the other party first, you cant expect her to be in two places at once especially when she has made plans prior

actually, we both invited her on the same day., me in the very morning when we were at our lockers and shes like 'ya! can't wait!' and then her other friend asks her and she cant decide. what can I do?

Maybe she can attend the one for a bit then go to the other. Is that an option?

not really. both parties are going to see twilight and mine is a sleepover.

If I were her I'd go to one for half the day. and the other for the other half of the day. I think SOMETHING like that could be worked out.

If she can't decide, flip the coin !!

the parties are on a friday.