OP, I'm sorry you're in such an unhappy place and I think some of the PPs' responses to you are overly harsh. It's obviously a preoccupation with you, but the line your manipulator will use is that it's you who are obsessed, because she's playing on your own insecurities in order to give exactly that impression.
Please don't give her what she wants.
Manipulators like this choose their victims carefully. You've just had a major loss (and condolences to you on that loss
) and it's not a state which is conducive to rational thinking or clear-headed decision making. I don't mean this as a slight - I also lost my mum and it's a devastating experience). Of course you feel shattered, confused and bereft in the wake of that bereavement, and who wouldn't?
Unfortunately it's often been the case IME - and in the experiences of others who I know - that people will truly show their hands to you in times of greatest need. After my mother's death there are some people (including sadly my in-laws) whose shameful behaviour has put me permanently at a distance from them. And they're not missed. Other people came up trumps when I least expected it. Sadly these situations will usually show you who is truly your friend in life - and who isn't.
OP - if these people can use your grief and pain as fodder for their own egos and nasty tattling gossip-mongering, don't do them the courtesy of explaining anything. They deserve no such explanation. If they want to think ill of you, fine - why waste your time trying to change their minds? You've just had to say goodbye to the person who meant most to you in life. In comparison this situation is small stuff, and these people are small fry. They really, truly are.
Concentrate on acknowledging your grief and going through that process, and allow yourself the space you need to heal.
And block, block, block.