Bit help please?.......................…

You should still start her in a snaffle. I suggest buying a rubber snaffle. The first thing she must learn is to ACCEPT a snaffle. Very very important. The curb action will only get you so far and then you'll find out she has no training base. If she's not soft and accepting of a snaffle she won't be properly accepting and soft to a curb. Start her again from the ground with the snaffle with NO PULLING. Maybe that's what's up. Maybe because it's a curb you aren't pulling nearly as much as with the snaffle. Soft hands are the key, she must be soft with a snaffle and you must not pull on her mouth. Be patient and train her. To lots more on the ground: bending, ground driving, etc. to get her listening to the bit and then once you get on, you can work on getting her to accept it and soften. She's 3 so she should be worked very hard and shouldn't be put into a frame. All you want is her accepting/giving to the bit, relaxing her jaw and poll, and stretching + moving forward into the contact.