As much as it sucks (trust me, I know from experience), it's standard practice for a T not to "pursue" a client - not to call or anything if a client walks out - because that can be considered pushing therapy on an unwilling participant. I'm sure if you reached out, she'd still be there. But, it's hard. i know. And it's normal to WANT them to reach out - for that to feel like care and this to feel like abandonment.