I don't think social media works well for these kinda things, but you could pick an activity you think she and her kid would enjoy and invite her out. Something casual like a museum or park. Take the temperature there and see how things feel.
My adage with dating is to err on the side of gaining a new friend as your goal. Then the worst outcome is you get a new friend.
Both. If there's a screw, I'm tightening it, baby.