<human>: Can you succinctly summarize the text in 1-3 sentences?

This might be a dumb question but I would be thankful for your suggestions. 

My mom has always been the glue that's held my whole family together (it's her, me, my little sister, and my dad).

She loves us all a lot and the concept of family is very important to her. Her and my sister are like best friends, they have really similar personalities (both extroverts) and they rely on each other for company and emotional support. I usually keep to myself, and I like it that way.

My mom's really struggling because my sister is moving about 3 hours away for college this september, and my dad is moving out because they are separated.

Both my sister and my dad usually keep my mom company and I'm really worried that with them gone, she's going to become very lonely and sad. She doesn't have much going on outside the house, and she's been really sad a lot lately because so much is changing. She was actually diagnosed with depression a while ago but she doesn't really see a therapist, she told me she doesn't think it's necessary (and we can't afford it anyways). 

So what can I do to be there for her and help her through all these changes? Do I just suck it up and talk to her more? Should I plan outings with her? I'm really worried, she is very much an extrovert and she needs that social interaction, which I really suck at. But I want to be there for her cause it's just gonna be her and me for a while.
<bot>: Dad and sister are both moving out at the same time, they keep her company, I don't know if my mom will be ok with them gone.