Could it be my grandma?

okay so a litle more than a month ago my grandmother ped away from having liver cancer. she was living with me in my house when she did p away. but before she ped away and before when she got into a coma she had said many strange things to us (at the time) but now makes aot of sense, she told us things that were going to happen right after she died. can people really close t death see what happens in the future? and also, the night she died (moments after) when i went into the room where she was it was colder than the other rooms, does anyone think that was her in there saying her last goodbyes?