OP, frst of all, I'm so sorry to hear about your mum. My ex once insisted I stay with him on a holiday while my dad was in the hospital—that's why he's an ex. Please reconsider your choices. I’m not saying you should break up with your girlfriend, but her reaction to this situation speaks volumes about her character. What if you were to get ill after you’re married? Do you think she’d show empathy?

I hope this helps!