Mama cat showing love to my pregnant cat.

Came across something a little unusual today. Cami climbed into Lissi's box and started showing her some affection, licking her and such, when before, they would actually keep their distance, and didn't really particularly care for one another. Just curious to know, if this has ever happened to any of you guys, and if so, do you think its a sign that my mama cat knows something's going to happen, as in Lissi about ready to go into labor?

Hun...never heard of that, but who knows....they usually act different when they're about to have their babies....who knows
Keep us updated!