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My Mother In Law Said What?!

AITA? Asked my mum to leave after constant lies

AITA? This is about my mum and not my MIL. My MIL is actually quite nice and we have a good relationship.
just bit of background info: I'm a SAHM with a 18 month old and 9 month pregnant with my 2nd child. I live in separate city to my mum and therefore get no help with my child. My husband works long hours and shift work so I've been parenting on my own. This had a massive mental affect of me and I've only recently recovered in the last year. Meanwhile My brother had tied my mum into free child care for the last 2 years for 3 days a week. Recently she's joining nursery but my brother has asked my parents to be the ones to pick her every day from nursery and keep her until he collects her from theirs. my SIL works part time and is perfectly capable of picking up her child yet likes the free time she gets when my parents pick up my niece instead. My brother and SIL have tied my mum into co parenting with them which has allowed her no time over the last 18 months to help me. It was agreed that once my niece starts nursery my mum would finally be able to help me with my second Child. As I've had no help with my first at all.

So, My mum was staying with me as I'm due soon however due to medical reasons when my baby Is born she'll have to stay in hospital to be monitored for a day or so. Because of this I'm super worried and paranoid about her getting illnesses or catching anything after birth. I had signs of early labour so my mum came down to stay with me however she still looks after my niece ( who is in the processes of transitioning to nursery). My niece was super ill , due to her first week in nursery, and she was looking after her and picking her up from nursery during this time. I explained to my mum that I cannot risk me going into labour and my newborn being exposed to illnesses straight after birth. So I kindly suggested to my mum to stay in her city as I cannot afford my toddler and newborn getting ill. I know kids get ill from nursery as my toddler is in nursery for 2 half days and when the baby arrives we're going to pull her out for a few weeks just to ensure the newborn doesn't constantly catch the weekly nursery illnesses.

My mum insisted that she wouldn't see my niece for the next 3/4 days to ensure she won't catch anything to bring. I said OK. Few days When my mum arrived I found out she has lied and had infact been picking and seeing my ill niece the whole week. When I confronted her about this she continued to lie to my face, even though I had video proof of her collecting my niece from nursery. Its the constant lying of lie after lie that upset me. And the complete disregard for my child's health if she was born that week. My mum then tried to gas light me and accuse me of not liking my niece even though I explained my reasoning behind my actions of not wanting to be around any ill children at the moment.

After a huge argument I asked my mum to leave and I cannot trust her to be around my children. She has shown favouritism with my niece in the past and as she's co parented withy brother for 2 years I know she has a strong bond with my niece. But to lie, potentially Make my child ill for the sake of what?

Am I the asshole for asking my mum to leave ? The same happened on Xmas where my niece had hand foot and mouth and my mum and brother never told me as they knew if they told me I wouldn't come. So they waited for me to arrive, when I then saw my nieces scabs all over her mouth. They had no regard for my child being ill. This is just one of several occasions where they've disregarded my child for my brothers kid.