Yeah she dropped Trek as quick as she practically could, then spent the next six years trying to get back into it.
Her argument was she wasn't being used much beyond "Hailing frequencies open, captain" which, well, goes for pretty much the entire cast who wasn't Picard or Data in the first couple of seasons before the show hit a stride. She was a young actress whose ego was larger than her common sense.
You don't quit a job you're contracted to do because you think you can make it big elsewhere. You HAVE a job. A several-year contract on a show with a large built-in fan base. Suck it up and keep opening those hailing frequencies. Don't be a 20-something
prima donna, think you're bigger and better and try and get out of a contract because that's not going to look good to future employers who read "Signed a multi-year contract. Wasn't happy. Backed out before the end of the first year."
I've met Denise Crosby and she's a nice, friendly, woman and I really don't mean to sound so harsh on her younger self but she really didn't think and/or got some bad advice. Worf wasn't being used much, Troi wasn't being used much and both of them toughed it out and look what they became.
It wasn't a smart decision on her part and that's not coming from hindsight that's coming from what should just be natural good decision making. "Don't quit a job unless you have a new one lined up, don't back out of a contract you're locked into."