My DD1 is asthmatic. Its not severe here though. She still plays sports etc. Sometimes she'll have issues, but usually its worse in general for a few weeks, so sport is affected, but then it settles again for a month or 2.

Hers was triggered by chest infections & an allergy to mould at 2.

We used to use a preventer. Til about 3 years ago. Because we only have attacks every few months we don't need to use it full time.

DD still lives a very normal life. Has never been hospitalised for it. There's every chance your DD could just have a mild case as well. Lots of kids grow out of it (my sister did).