Ally genuinely is friends with Tori, so even if she did choose to tweet it as some sort of subtle acknowledgement that she won't be watching Camila (and honestly I don't really think she did), I wouldn't go so far as to consider her tweet "shade".
Mani's tweet on the other hand...

Besides Camila, she would be the quickest out of all of the girls to jump at a solo opportunity, so this is really hypocritical of her.