J.B.
It could just be a clingy phase that she's going through and that she has a bit of an anxious temperament. It's good that you asked in case something had happened that you need to be aware of but it could very well be that she's just hitting a phase. If it gets to a point where it interferes with her ability to enjoy life you might want to talk to her pediatrician and perhaps have her screened for anxiety, which is increasingly becoming a problem for a lot of children and adolescents. At 9 years old, she's at the beginning of a new developmental phase and might just be experiencing a "step back" in needing mom and dad a bit more before she becomes more independent again.