I have two siamese cats, a male and a female, both of which are 17 years old and were together for 17 years. The male just died last week. Since my female is also 17 years old, and in good health, because of her age I do not want to get another cat but I am worried that after 17 years she is suddenly alone. Is that okay? I was thinking of getting one or two cockatiels to keep her company. Is that a good idea?