Broly is too powerful. Due to the waves nerfing everyone's powers she might not even be long before the tournament of power SSB tier. Broly held his own against a much stronger SSG Vegeta. Her only chance would be to use an immediate Candy Beam. But this is not something she would do in character. She'll only use that after defeating her opponent or as a last resort. In the case of a last resort it would be too late. As this version of Broly is very intune with his Saiyan instincts. He won't try to tank the attack. He'll either avoid it or put up a barrier that is too strong for the Beam to get through.