No they wouldn't take a slight majority, they would maul her. Betty is a high class 100 even without the Wishing Well. Heimdall could give Big Barda a good scrap, while Betty would defeat her straight out. Betty was able to punch through a dimensional barrier, which is an absolute ridiculous feat if you were to think about it for a second. She's also quite skilled with that sword of hers that was made in Asgard, and enchanted with a portion of the Odin Force. It's the same sword that was able to pierce the Hulk's hide in the Dark Dimension.