18 month sleep regression or sickness related?

My toddler has transitioned to 1 nap about a month ago. She was having about 1.5-2 hours in that nap. She has been a bit sick this week but she's only been sleeping 1 hour during the day all week! Yesterday she got woken up by the dog barking after only 20 mins and I couldnt get her back to sleep allday! I gave her an early bedtime but still! I am finding it very overwhelming because I've gone from having 2 one hour naps and time to myself to just the 1 of 2 hours and now it's only an hour! Is this normal? I prey it's not her new normal. She's also been waking up 20 mins after being put to bed amd despite not sleeping much during the day she's woken up 3 times in the first 4 hours after bed then I lost count after that because I came to bed.