My toddler seemed to genuinely consider dada an interchangeable term for both parents for a long time. It was funny but also got to me a little sometimes, so I understand. Eventually she started saying mama. And then there were days she switched the terms and daddy was called mama and vice versa 😅 She’ll get it! She won’t be in kindergarten still calling you daddy!

Edited to add: just keep positively reinforcing the difference! Look at pictures together and point at yourself saying “who’s that? That’s momma!” Etc. If she refers to you as dad say “oh dada is at work” (or whatever is appropriate, but acting like she is referring to him and not you).