Thanks for all your suggestions ladies. To answer some of the questions:
Yes she does eat 3 full meals a day plus snacks. I try to make sure she is nice and full before bed.
I have tried giving her a dummy but she hates them. Have tried all sorts of brands and types. She isn't a fan. So different to my dd1 who was dummy obsessed. I have tried offering the dummy instead of the boob even to the point where I have placed it infront of my boob and she latches onto it instead, but she worked that out really fast and pulled off and screamed.
I tried letting her whinge a bit before going in. This just made the process longer because she wouldn't go back to sleep unaided and woke up completely.
I tried patting her first or cuddling before offering boob - she squirmed until she reached my chest!
I tried only letting her suckle for a few seconds and then removing the boob. She just kept her eyes closed and mouth open searching until she could re-latch.
Thank you for all the suggestions. I think I will go ahead with the sleep clinic. I need the support from the nurses and I just don't want to do it at home because my dd1 and dh have Kindy and work the next day and it's unfair on them. She gets so loud when she doesn't win.
If anyone else has ideas please share but I'm feeling like I have tried just about everything. Even more tired today because I tried hard last night but didn't get anywhere because she was more awake and ready to fight me!