They can still get it even vaccinated and the vaccine is annual.
It does sound like it - poor hully.
One of mine had it recently (we thought) and was sent away with metacam for discomfort from coughing and a cough medicine recommendation (I forget which one). In the end the cough only lasted three days and he was under the weather for less than two weeks, so fingers crossed.
Thing is, she's Hully, whirling dervish of mayhem. So she's basically still acting like her but with intermittent retching haven't heard any coughing now she's tucked up in bed (soft dog bed AND her own double duvet in the kitchen).