Question

Hello
I dont know why my mother acts like that it just makes me feel deeply sad, uncomfortable and abandoned.
I hold no grudge towards my mom.
But why whenever I feel sick and I tell her that I feel sick, she seems ignorant she has no reaction , its like she tells me something like ‘oh really’ or ‘why is that’ and then she continues what she does as if i said nothing. She can even go out or spend time laughing or watching tv series when she knows that I am sick in my room.
I dont know i feel that she doesn’t feel my pain when I really need her to feel it. Even when i tell her about anything that is making me feel sad she seems as if she is an (ice brick) , i mean no reaction no sympathy.
At the same time she doesn’t treat me bad , she laughs with me and allow me to do whatever I want, but when it comes to me venting to her or when im sick I just feel I dont have a mom!
What is confusing me is that sometimes she comes to me when in sad and tells me to stop sitting alone in my room ( she did that maybe once or twice )
So Im confused I dont know wether she loves me and cared about me or not !
Although she shows caring and empathy and sympathy towards my sister’s little daughter.

Im really confused
Why is she behaving like that
Is it that she doesn’t love me ?