So I need some advice !

So I’m in a relationship and we’ve been together awhile.

My partner has a 6 year old from a previous relationship. This child has been in my life since she was 6 months old.

Now we have a 2 year old together.

Anyway I don’t treat either of them differently, I get mad at her for things I’d get mad at my 2 year old for n I try to always keep things the same between them. If I get one someone I always include her. I practically feel like she’s mine.

Now this is where I’m starting to get a little frustrated and need some help on how to go about this.

So my step child comes over every weekend. And we have always wanted to do fun things with the both of them. Anyway recently she’s just been very demanding like expecting us to just go do what ever she wants whenever she’s here.

Now my partner doesn’t say anything to her.

She comes over she’s rude to my daughter.

And if we don’t do what she wants she just has this attitude.

Now my partner says that she isn’t old enough to understand and Watever.

But I’m just at a point where I just distance myself because we only ever do things when she is here. And there are weekends she doesn’t come and I want to take my 2 year old out but he just won’t want to.

I dnt want my 2 year old to also think we only get to do stuff when she’s around.

I’m sure it’s guilt tht he doesn’t see her daily so he just wants to make her happy. But it’s at a point where it’s causing friction in our relationship and I just don’t know how to go about it.

I feel like these things need to get addressed early on so she doesn’t grow up thinking tht it’s okay to act this way.

If we’re not doing what she wants she immediately just wants to go home.

So how can I just make her be more appreciative and realize we don’t have to be doing all this.