My condolences for the sad loss of your grandmother.
Your meds may be the reason for the numbness that you're feeling right now. But sometimes, Ashley, people can just go numb when confronted with the loss of a loved one. It can be seen as a way of the brain reacting to create a "bubble" in an attempt to protect one from getting their heads around too much too soon. See it as a form of safety net, parking this event until you're reaady to fully process it.
There's no need to fight or worry about this sense of numbness right now. To show emotion as crying or getting angry shouldn't really matter right at this moment. The fact that you're thinking and talking about this shows that you're still reacting.
But although it's sad that her life is over, smile that she lived and that you was part of it.