My nan is in hospital, don't know what is going to happen

A hard time for us all right now but all seem to be coping well. Yesterday, Friday, myself and my 2 daughters saw my Nan, their great nanny, to give her company for the night. My uncle lives with her but needed a break which is why we went. When we arrived she wasn't feeling well but kept on deteriorating, with chest pain, shortness of breath and really high blood pressure. She also has alzheimers/dementia so doesn't remember what she does during the day but we know she can't sit still for 5 minutes. 

Anyways, we called for an ambulance, which they said would be 2 hours. After 2 hours we phoned up again because she got worse, and they said that they would get a paramedic or doctor to call us back whilst we wait for an ambulance. Around 10, I left with the girls to take them home. She is now in hospital and the doctors don't know what's wrong with her and how long she will have to stay in or even if she'll make it out.

A few years ago, my grandad passed because of a heart attack in hospital and he had similar symptoms. He didn't tell anyone until he had a heart attack in hospital. My eldest keeps asking how she is and I keep saying the same thing, same as yesterday. She is slightly worried but has been so busy keeping her mind occupied she hasn't thought about. We are also thinking worse case scenario because she is 89 and has lived a great life. 

I just need to offload so thank you.