Girl blew me a goodnight kiss after a videocall, what does this mean?

I (22m) have known this girl (30f) for 2 years. We have been talking on and off for a while online with little to no romantic hints even though I have a crush on her. We talk just mostly politics. We video-called a few times and topics were almost always research-based/politics. Last time we video-called, it lasted for 4 hours. After I said I’m going to bed, she blew me a good night’s kiss. Then we sort of talked again and she told me to go to bed, and blew me another kiss. For context, it was a fast blow of a kiss without the hand gesture associated with it. I reciprocated. Does this mean anything?