too late for me to tell you what to do immediately after, like
baking soda and water
tea tree oil
write distilled vinagar or apple cidar vinegar
or my favorite for insects bites. peppermint or lavendar oil applications every so often.
but after this point , like any wound or opend blister, keep it clean, check it every day. clean it when she gets inside.
keep at hand a spray bottle filled with 10-20% white distilled vinegar or apple cider vinegar and spray her down before she goes outside, keeps the insects away and makes her coat nice and shiny. theres almost nothing you cant do with either baking soda or white distilled vinegar... whether its for pets or household chores and hygiene. look into it!
...now, how is she doing lately, is she eating? is she active?
me myself, i spray my entire clothed body down with the solution before i head out insect ridden areas ( ie... 80% of the entire world) I take insect and insect bites seriously, yet, theres nothing you can do about stepping on one accidentaly...hope she is doing good, let me know.