Why should my girlfriend think too much even regarding little things?

Name: Aarushi Date of Birth: 9th February 1999 Place of Birth: Delhi Time of Birth: 8:25 PM

My girlfriend continues to ruminate on anything, whether it is a text or otherwise. Even minor problems cause her to spend hours becoming nervous. I attempt to reassure her to stop thinking but according to her, there is no end to her thoughts. This is as though she was on her legs. I apologise whether her Mercury or Moon in her chart is overassuming everything in her. I would like to make her calmer and leave so much worrying behind her.