I just need to vent because I just cannot believe it.

So my husband’s grandmother is 100 years old she just turned 100 in October and she has been a very healthy person she can still walk, talk, think and it’s very witty. I’ve had a chance to meet her once last year for her birthday and she is such a kind soul. Anywho these past couple of weeks have been really hard on her as she has had kidney stones and went into surgery to remove them then contracted a cough so they kept her and tested her for Covid. She has been cleared of Covid and sent home only to have a stroke that night and go back to the hospital. This makes me very sad as she has been alone since no visitors are allowed due to Covid and she’s not tech savvy. When speaking to my sister about it she had the audacity to say “they just need to let her go, they need to remove the tubes in her nose and let her go She’s 100, plus it’s not like when dad died at 50 years old from a heart attack. Your not close to her” - my heart seriously dropped you guys like I couldn’t believe it. So I said “first of all she doesn’t have tubes up her nose, second she’s not in a vegetative state for her family to just pull a plug. She is alert and alittle disoriented. Third of all she is a life, she is someone’s family and everything no matter what age.” And she just kept saying “yes but she’s 100, it’s like if our grandma died tomorrow we wouldn’t feel bad ” (what?!) I was in shocked to hear the lack of empathy she had so I just hung up. I couldn’t believe it, and now tomorrow I have to pick her up so she can do laundry at my house and I don’t feel comfortable. Am i overreacting or is she under reacting? Thoughts?