Hi,
I'm no expert but I would probably try putting her in there when its not bedtime with a few toys so she starts to like her bed. I would ALWAYS respond to her cries immediately so you don't break the trust with her.
Next thing is to keep doing pick up put down (PU/PD), but as a last resort. Try to soothe her in her bed first by patting her bottom and saying shush in her ear quietly and rhythmically, try a firm hand on her back or tummy, and whispering sweet nothings, just comfort her etc then use PU/PD. It will probably take 3 or 4 days to change but then It shouldn't take more than 20 mins for them to get to sleep on their own.
Hope that is a starting point.
Lou