P.M.
You might try excusing yourself from her room for a few minutes at a time. Not every night at first, but then occasionally for longer periods, and more frequently. Always come back if you promise you will, and she'll gradually trust that you're there for her, even if you're in another room. While you're out of the room, avoid coming back while she's calling for you, if possible; wait until she's quiet for a few moments so you won't train her to keep calling.
While you're out of her room, tell her that her (teddy bear, doll, etc.) will keep her gentle company and cuddle with her. When you return, thank the toy for snuggling so sweetly with your daughter. Treat it 'almost' like a living entity. This will allow some children to gradually switch to the toy for comfort. Some kids prefer a blanket.
Be aware that sleep patterns can change for all sorts of reasons during the child's first few years, though many settle down pretty well by 2.5. Kids go through periods of separation anxiety, but the leaving and returning should help with that.
I remember needing a very long time to fall asleep as a young child, but my mother was strict about no comfort from Mommy. I remember crying myself to sleep on many occasions, or being afraid to say I was thirsty or cold. I simply could never do that to a child. But you can probably wean her from needing you with gentle steps. It might also help to move her bedtime up, 15 minutes at a time, to a somewhat earlier schedule so she'll get enough sleep, and you'll still have some evening to do other things. This can be more difficult when days are light for so long.