Re: MIL again.
She didn’t start doing this yesterday. This has been going on forever. Nothing new here.
Does your husband like your Roti? If he does: No issue. If he doesn’t: Ask her to teach you how to make proper Roti. That way you will shut her up and give her a bit of an ego boost (which apparently she craves for).
Very typical MIL/mum behaviour. Your MIL is no exception there. When she complains that you don’t do this n that, you simply point out that she doesn’t let you.
How is this an issue? Are plastic bags such a rarity in your house?