Could be she is starting to realise that she is going to bed and you are leaving her to sleep. I know it's upsetting but once you have put her down, wait outside her door till she settles, it may take a while to start with, but it will get shorter once she realises you won't pick her up when she cries. I know it sounds harsh, but you know she is safe and nothing wrong with her. As for waking at night, could be bad dreams, (one of mine used to have night terrors,) just go in put your hand on her back or stroke her face till she settles. Do not pick her up or speak to her.
Good luck, it may take time, but will work in the end.