I guess losing someone she loved again was too much for her to handle. I wonder what she would have done if she had never met the Doctor after she lost Danny?:(

At least Clara had some fond memories of her mother. She didn't have to deal with a nagging mother like Donna did.

Rose can only go by the stories her mum told her. She did have that brief chance to see what dad was like and comfort him before he died. I just didn't like her daddy issues at the end of "The Idiots Lantern".