Indicators of Disinterest

In Person

Body turned away from you
Has phone or other object out and engaged with it
Appears annoyed or bored with the current interaction
She shuts down intimate moments
She keeps her distance from you in an interaction
Direct eye contact is usually avoided
Her friends come and swarm you, usually involving her departure

Text and Phone

Responses are often short
Message response time ranges from very late to never
Emotion appears to be lacking in the conversation