It took some courage for Buffy to make this decision - but Joyce should know the truth (+ future) so I think it was the right one.
And with Anya there it sounds right :))
Good choice what Buffy made, too.

Author's Response: I'm sure being in heaven would have been the easy way out but I think after the death Buffy realized it might have been a mistake. Thankfully Buffy when faced with a hard decision and with guidance of her mother, she makes the right one :)