I'm also fairly confident you're mom is putting two films together.
The part of egg sacks and stuck victims to be feed on is most likely from Aliens 86.
The heating blanket melting the alien in ice is from The Thing from Another World (1951).
You should ask her if the film was black and white, or color. That's not an easy thing to remember sometimes though.
There are other films where there are egg sacks and people bound to be be food. There's spider films that do that, but I can't think of any alien films that do that besides Aliens and it's sequels.
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