Its more than likely that if shes grieving and not answering phones, etc, that she won't go out for a while
If shes having fun if she does go, she might take it as a bad thing again. People when they grieve you see, do it in many different ways. Theres no wrong way to go about it though, as you must understand its the persons way of coping with it.
She'll also not be like that forever though. She'll come through. If the funeral hasn't happened yet, she'd be in a worse state than after.
Maybe you could support her by going to it? If that seems right to you.
To know you care is something very valuable to a girl, and you do, so thats a good thing
She'll get better though, trust me. It'll take a while, but she will. You'll find as time goes by if you support her, by doing even little things when you can, that she might warm up to you and become more open to the way shes feeling.
i hope this advises.