As she grows older there will probably be times when you find the situation requires it: e.g. when she and two of her friends are creating havoc and you need to tell them off as a group
Or when she and her friend ask you to help them with their homework.
Or you are organising a birthday party or day out at the zoo for a gaggle of excitable 8yos (in this kind of situation it makes good sense to treat your dd exactly like somebody else: a reputation for not playing favourites is a great social asset for your family and hence for your dd).
Or you take her to the doctor or to parents evening, and because she is that little bit older, the doctor/teacher will want her to discuss the situation with both of you at the same time.
Or her friend is having a sleepover with you and needs to feel that she is being included in conversations and would dare to ask you for reassurance. (In that kind of situation it isn't about what other people consider rude, but about another child needing the same reassurance that you would want your own dd to have when she is staying with strangers without you.)
Ime when children grow, it becomes less and less of a 1:1 relationship, they are (most of them) social beings and your living room will become an station interchange where pre-teens pass through grunting mysteriously and leave their debris around and you may at times struggle to remember which of these uncouth creatures actually came out of your vagina.
Otoh growing up may also mean more opportunities for your dd to forge her own relationship with people her age speaking her minority language. My dd is on facebook, she has pen friends, she texts her cousin several times a week and sends him postcards when we go away. When we go back home, strange teens appear that I have never heard of but who have clearly put dd's arrival in their diaries as a social event.
I was never worried about my use of the majority language constituting any kind of threat to the minority language and it hasn't. Dc know I speak English anyway- how could they not? they know I go to work - but they also think it cool that we have our own language and our own little world together. Particularly useful when they get to that pre-teen stage where everything that comes out of a parent's mouth is an embarrassment. Ds finds it very reassuring to know that he can control this threat to his street cred when we are out and about simply by switching to a language that any passing mates will not be able to understand.