Hope she went peacefully, and with a sense of going to a better place, or contentment with her time is she doesn't. Before my birth, my grandfather went down in the driveway of a heart attack, grandmother went two days later. Sometimes it may be best, even if we want to hold on. A sign of their love being so strong, it seems.Rest in Peace.
I try to hold onto not being sad for no longer having something important, but being happy for it to have been so important for so long.