Hi,
does your daughter sleep in her crib for naps? Does she sleep in her crib at all right now? has she been able to fall asleep on her own without you rocking her, or the swing?
Our son (who is 2 now) used to fall asleep easily & then at times, as soon as we put him in his crib, he would wake up...my husband figured out that if he bounced the mattress to continue some motion, this helped him back to sleep. We had to work on a sleep routine & helping our son to fall asleep without being rocked, and like you mention, put him in his crib awake. We had a few rough nights (well a few weeks, to be truthful) of him crying for what seemed like hours, and we would just tag team & go check on him, not make eye contact or pick him up but just tell him it's time to sleep, we love him, & that sort of thing (briefly) & let him try to soothe himself to sleep. You have to use your judgment, since sometimes we couldn't stand it & knew he needed to be soothed more in a physical way...but you get the idea.
It's important for children to know how to get themselves to sleep, especially if you want an easier job at naptime & bedtime. You have to use your own judgment about how much/long you are willing to let your child cry, tho...we have known families whose children don't go for the "crying it out" business, and can carry on quite a crying marathon.
Some things that worked for us for bedtime routine are: put a relaxing cd or tape in a boombox in our son's room & let it play while he is trying to fall asleep; we have a special light that shows stars & moons that he likes to have on to look at while he is falling asleep; play a mobile over his bed; we attached a crib "aquarium" toy that he can control that also has soothing music & ocean sounds (this was a true lifesaver! he uses one at his grandma's house as well); and sometimes let him take a board book or two into his crib to look at while he becomes sleepy.
At the beginning when we were trying to help him sleep on his own, we(one of us) would sit in his room with the lights off, in a rocker next to his crib, and just rock & be there, but not engage with him, while he tried to fall asleep. This didn't last too long (number of nights we had to do this), and sometimes I would just bring in a pillow & blanket & sleep on the floor next to his crib until he fell asleep, then go out to my own bed.
You have to be creative; try lots of different things, and like you said, pretty soon she'll be too big for her swing & you'll have to switch to using other ideas...
hope this helps, & good luck!