To all mamas

My daughters mom called my husband and I and asked if we will help with our daughters additude. Her mom thought it was cute at first and once it got in a habit she started asking if when we get her for summer if we can help fix it. She said taking away toys, grounding, taking away her phone (which punishes us and the rest of her family here) woopings, and talking won't help she said. She said she has a problem with talking back and hurting people's feelings and not listening. My husband said this will get me a little closer to feeling like a mom if I nip it in the butt (he has a quick temper so he's not paitence) so my question is how do I fix the issue? She let her do it for 3 years. Is it to late to fix it?

Love,

a step mommy