Two year old with dry cough

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We've been at home for two months now because of a newborn. So my toddler has not been exposed to illness. But I noticed she has a dry cough now. She only has 1 or 2 coughing spells during the day. It's dry. Not other symptoms. No snot, no fever, no sneezing, no watery eyes. Any ideas? She had rsv at the beginning of June and we've stayed quarantined since with the new baby. I mention the RSV bc she ended up on Albuterol and the ped said the way she reacts to RSV he's worried we may looking into an asthma diagnosis down the road. My mom has asthma and these don't seem like attacks. It's not provoked by activity either.

I'm obviously going to ask her ped too just looking for other moms input until I can call in the morning.