Just ignore her.
First of all, she won't be contributing to this event.
Secondly, are u going to be using her place? If no, even more u don't need to seek her permission.
For me, for my first child, i did a birthday part. Just buffet and cakes.
Called relatives and friends. Simple but a happy function.
Just as a respect, inform them as a formality, if they don't attend, just don't take it to heart. Just ignore and move on and enjoy the celebration
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