"मेरी दादी नहीं आ रही हैं ।"
Translation:My grandmother is not coming.
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Please ignore this misinformed rule. I don't know why they chose to confuse new learners.
It is always OK to use Hain/hona in a negative sentence. There are many instances where they may be dropped in a negative sentence but it is always OK if you want to use them and you can't be said to be grammatically wrong for using it.