It may just be that you're mum and you're always there. She can rely on you to be by her side and give her what she needs.
Sometimes Dad is more fun because he is seen less often and does all the fun stuff!
My son prefers his Dad and his Poppa and Pop. He gave them all smiles and cuddles before me. I was sooo jealous!! The first time I got a hug was when I went away for 1 night, he hugged me so tight the next day (I was gone for 48 hours), but the hug only lasted 5 seconds and then he was just happy I was there again!!
You could try and do fun things with your daughter? Like take her swimming or play peek-a-boo. Find something that is fun for just you two and dedicate at least 20 minutes of just fun

I know it's hard, but sometimes mum is just boring. In a way that's a good thing, because it means you're stable and loving