You should stick to your current and whatever is more comfortable for you. Even if you move back to your MIL's place, you might become unhappy about it in the long run and ended up having alot of grudges, this is not good for yourself, your relationship with your husband and your baby.
Also, it is just a passing phase. When your baby gets older, he/she will not cry around her anymore. To help improve their (baby and MIL) relationship now, going over on weekends for an entire afternoon will certainly help.
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