Definitely a talk with you and dad and DSD.
You need to prime him in advance and just be the silent party, as hard as that is.
He needs to ask her why she says it? Point out that he drinks just as much, if not more than you, and why doesn't she comment on that?
Say that there are some things it's not ok to comment on, even if she thinks it is a joke it could have serious consequences.
Get him to be explicit that it's not ok to comment on what people eat or drink or what they look like. Say that applies to everyone, including friends and family.
He needs to tell her that you have been very understanding but someone else might not be quite so kind, and so he needs to make it clear that any comment like this about anyone in future will have the following consequences
- go to room/electronics removed/time out - whatever works.
Don't be with her in front of others unless dad is there too. He needs to be on it and call her out in public every single time. It will not be as effective if you do it. I don't know what your relationship is like, but it sounds as though she's enjoying winding you up - does she do it to anyone else?
You then need to be the good guy. Plan a nice treat with her when she's over and rise above the comments. Say at the beginning of the visit that you're going to do painting nails/baking a cake/going to the park/watching a film together - whatever she really enjoys. But crucially it's happening after any socialising and just before she leaves.
Then if she makes the comment again, dad has to be the one to swoop in and stop it. Say that HE won't allow her to have the nice treat until she stops making that comment. You can do the sad face and say "hopefully next time DSD, I was looking forward to doing this with you".
It sounds like there are a few mixed up feelings about you in there. And whilst that is understandable, she needs to hear from her dad that she must be civil and treat you with respect. Then it's not you going to him and "telling tales", it's him seeing her behaviour and her learning that he isn't going to allow it to happen.
Good luck!