Does she have access to very old paint? Meaning produced before 1978. Paint produced since then is generally expected to be safe. Just keep an eye out for anything she might be nibbling on that's not appropriate.
There's some very preliminary evidence indicating that cilantro (coriander leaf) might help chelate heavy metals in the body. http://europepmc.org/abstract/MED/86...K5QqsGeIgkpc.8
So you might want to add a little to the diet. There's no guarantee that it will actually do anything, but in any case it's a nice green vegetable that my cockatiels enjoy eating. Moderation in all things of course, so don't go crazy with it.