I think you need to sit down and talk to your MIL. Have a heart to heart talk. Maybe she doesn’t feel appreciated or she thinks she knows it all. Anyway, just thank her for all her hard work, for letting you stay with them, for taking care of your baby. You and your MIL both want the best for your baby and bringing her out (with ongoing COVID) and feeding her new food isn’t the best for your baby.
Are you currently working? Would you consider infant care, then? I would be quite upset too. Dabao-ing food.. maybe if there’s no choice. But visiting other people is a no for me. Who knows where they’ve been and whether they’re sick?