We never had a problem with it until this year (6 & a half).
This year my son started sneaking out of bed after being tucked in to play with his toys. VERY quietly. He would also put them back very quietly. Unfortunately for him, he would invariably either a) need to pee, or b) feel scared going to bed without being tucked in again. So he was caught out.
Now I will read or work on the computer before bed. Sometimes even watch a movie. I also HATE going to bed alone (have of course, done it for years, but it's not something I enjoy. Most adults, in fact, "do something" as they're getting ready to fall asleep, whether it's reading, working, talking to a spouse, "extracurricular activities", music....something that helps them wind down.
I know a lot of parents think that children should be trained to fall asleep in a very spartan way, without the comforts they give themselves. I don't. Sure, his bath and storytime and being tucked in used to suffice. Obviously, for my son, he's reached a little bit more independent stage. Something in him is telling him that it's time to start learning how to soothe himself...the same way that we do as adults.
Granted it took me about a week of "GO. BACK. TO. BED"isms before I really thought about it. Okay, he's ready to be learning more independent behavior. That's fair. Now how do we help facilitate that?
What we did was to move his "bedtime" back half an hour. So now, he's ready for bed & had story/snuggle time by 830...but he doesn't have to be "in bed" until 9 still. He can read in bed if he likes, he can also build, or work on an experiment, or play with any of his quiet toys for up to a half an hour in peace and private. At 9 I go upstairs and either kiss him goodnight or I rearrange kaddywhampus sleeping limbs into a more comfortable looking position and THEN kiss him goodnight. That's because about once a week he just reads a few pages and shuts off his light and falls asleep.
Can you do that with a toddler? I know a few people who have, but it was because their children were ready for it...mine wasn't until this year. I know other toddlers who won't stay in bed even if their lives depended on it...and we kept ours in his crib until he was 3 (and not only wasn't he a climber, he was one of those super active kids that usually fell asleep .03 seconds after laying him down), so I can't really speak to that. Even in his crib he always had a few toys to play with if he liked, and his blankie to snuggle with.
I've had to sleep in a cell from time to time (either on a ship, or traveling -monastery-, or while in the military, essentially here or there), and I have to tell you I hated it at worst, and was merely uncomfortable/distracted by the lack of familiar comforts. The point of which, being, that like most people I judge others by myself...and only after something turns out to be false, do I make the change. So I set my son up with what *I* would like. If that turns out not to work for him, or if he likes something different...I change it. No harm, no foul.
My suspicion is that new toys are YES going to be a distraction at first. And then the distraction will wear off as the "new" turns into the regular and forgettable. Then again, she MAY not even notice overmuch...if she's as sleepy as my son was at that age. I suppose the question is do you want to teach her to ignore distractions when she needs to sleep...or do you want to create a distraction free environment so that you don't have to teach it? Personally when given the choice of a couple of weeks v. years I tend to go for the couple of weeks. But obviously, that doesn't work for everyone.
Best of luck