I was chatting with my mum today and somehow we got onto the subject of whether you can ask Alexa to call 999 for you.
So I googled, and you can't. However, you can set up and emergency contact which it will call for you. So once set up, you can say "Alexa, call for help".
So, just for info really that if you or family members have an Alexa, it could be worth setting this up just incase.