Why she made that decision?

Last year I was living with my mom in a 4 1/2 apartment but suddenly around like late July-Early August, she decided to send me somewhere else to live, she rented a room for me in a house, that she paid monthly, where I stayed with strangers and I lived there for about 4 months (Early August to Late December), and during this time she stayed with her sister and she stored the furnitures in our apartment, and then in late December I returned living with her in a 3 1/2 apartment, a smaller apartment but why could she has taken such a decision?

Why she made that decision?
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