You have to talk to your maid that do not take anything she says to heart and do not get bugged. You have to form a secret team with your maid, and in unsaid ways communicate to her that you two are on the same page.
Also, you can have a word with you MIL or best is to tell your husband to convey to his mom that it is very difficult to find a good help and if she keeps nagging her, she may leave. And the situation will be very difficult especially for her as she would have to look after the baby and the home all by her own when two of you will be out. I think your husband will be better person to make your MIL understand. So, let him do the talking.
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