I think your anxiety is understandable seeings as your DD is vulnerable. I myself feel very anxious about catching it as DH is vulnerable so I get it.
But please try to remember that all the evidence suggests that the chance of transmission outdoors is extremely low. It's recycled air indoors with lots of people that causes problems.
Even if they did have covid (and it's not a given that they do) the chances of her catching it in that scenario are very low indeed 