Well, we are always fine with apping characters post death. If you are referring to her knowing certain things that happened after her death due to certain circumstances, we are also fine with it, as long as that is supported in canon. Though for exactly how much and with how much detail she could know (beyond, of course, that what already is confirmed in canon), you would have to talk with your cast mates and work it out.

I hope that helps clear things up.