She sounds just like Rosie when she was younger. She hated us petting her, but now she loves cuddling. We praised her A LOT when we would pet her. She'll eventually understand that's what you want. Give it time.
As of treats, Yorkie Yummies work great here and meaty treats work well. This is hard because every dog is different. I'm lucky because Rosie does anything for treats
Like Megansmomma said, give it time. It took us 1-2 months of baby steps before Rosie got used to brushing.