<human>: We've been seeing eachother for about 2 months. Things have escalated to the point of her sleeping over and has met my family as I have met hers. 
When I met her, her mother was living diagnosed, but in the last few weeks it's taken a downward turn. 

We don't talk about her mom often, from what I gather she doesn't have much time left.

Although it's amazing when we get together, her moms illness is obviously emotionally overwhelming her, and the last few days she's shit down and been VERY distant from me :(

I've never had to deal with illness or death fortunately in my family, so I have no way to understand what I need to do/say. I try to be there for her, and while I ask how her moms doing, I keep it brief. I don't think she wants to dwell on that topic during time spent with me. 

The last few weeks we've been talking a lot, and incredibly affectionate with eachother. But in the two days passed she's been bailing on plans and being very distant. 

How do I handle this? This girl really matters to me :(

Can you succinctly summarize the text in 1-3 sentences?
<bot>: girls mom has cancer, causing emotional disturbance in the natural progression of an early relationship, but I care too much to quit her.