What do you mean when I send a hug expression pack and a girl returns a cold expression pack?

She is expressing that she feels cold or uncomfortable.

1, hug means: hug, comfort, sympathy, give each other a hug after considering each other.

2, from the network language, the author is unknown, in the love relationship, girls may want to suggest that their boyfriends need more care and care, and at this time they can take the initiative to help and enhance their feelings.