Monitoring my mother's health from a distance

What's the best way to monitor my mother's health from a distance during COVID-19? She's 74, has some health issues (high blood pressure), lives alone, etc. and just told me over the phone today that she has a sore throat and a "dry cough." So, naturally, I'm starting to panic, but maybe I'm overreacting. When talking to her over the phone/facetime, she seems... ok. She's had the sore throat/cough for a few days. No other symptoms she says (fever, difficulty breathing, etc.), but I'm not sure if she's just downplaying them or if she's really doesn't have those symptoms. How do I check in with her to see how her symptoms are and if they get worse... what do I do?

I took our province's online based on her symptoms self-assessment and it says not to call in to get tested. Just stay home.

I'm kind of worried because I flew to visit her just over two weeks ago. I feel fine, but did I catch something in the airport and pass it on to her? That's what I'm worrying about. She doesn't come into contact with a lot of people, she's pretty much a shut in. Which, for once, is slightly relieving. From my estimation she only talks to the garbage man, mail carrier, grocery delivery person, and, two of her neighbours. It's probably unlikely that she has covid19, but I'm concerned about what to do if she does. If her symptoms get worse, what do I do an when do I act? I'm about a 4.5 hour drive from her.