Is this bad to do?

My moms in town and staying with me. I have a 6 year old & 6 month old - between them both & back problems I often have nights of barely any sleep.

On weekends when my 6 year olds not at school (like today), my 6 month old wakes up at the usual 7 AM time, so does my 6 year old. I feed 6 month old and attempt to get her to go back to sleep (usually sleeps more until 9-10 AM).

If she doesn't go back to sleep on weekends and I'm exhausted, I put her in her nursery in her crib with a pacifier where I know it's safe and I won't fall asleep with her. My 6 year old asks for tablet time. If I want extra sleep, I'll ask 6 year old to go sit in baby's room (nursery glider by crib) on tablet instead of my bed. Just my 6 year old being in there prevents baby from crying and she often just babbles at her or goes back to sleep. My 6 year old will sit and play games or watch shows on tablet and occasionally give baby her pacifier. I have a monitor where I can see and hear them both and is at my bedside.

My mom woke up around 6 AM and saw this weekend routine. Said my daughter is going to resent me for making her "play mother" to our baby and I should just get up like she did when I was a baby. I tried explaining this is a weekend thing & none of her business really but now I'm wondering if it's a bad thing to do this?

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