i was going to say the swollen lips were from postmortem changes but youre right, she might have had lip fillers or something during life!
as a reference i looked for PM photos on NamUs of those who died in the water, i think its good to know common characteristics so you can guess what features happened after death vs what features they had in life - out of respect i won't post them directly but ill link the photos instead.
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19. id say those who look to have started decomposing like #3, 4, 7, 14 and 8 have all-over puffiness that's not concentrated to the lips (except maybe #11?). the mouth/jaw looking off-kilter seems to be common so i wouldn't say it indicates past injury. one interesting thing is i didn't see any people with the random looking mottling/bruising that this UID has, so it is making me wonder if she was already injured when she entered the water or if her face was smashing against things in the river.