When my 6-month-old kitten was sick and in the hospital, his 3-month-old "sister" would walk around the apartment yowling constantly. This would be broken up on

When my 6-month-old kitten was sick and in the hospital, his 3-month-old "sister" would walk around the apartment yowling constantly. This would be broken up only by periods of her clinging to/around me in a way she never has before or since (she was always much more independent than the other one), before going back on her search.