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Could you help me with this please? Which would you say?

1 She's falling behind/running behind schedule.

2 She has scheduled a long session for today.

3 How much money is there left to pay on the bill the trimester./is left to pay... (how would you say this?)

Thank you
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Hi,

1 She's falling behind/running behind schedule.

Often, no difference is intended. However, there can be a difference.

She's falling behind behind schedule. She is getting more and more behind schedule.

She's running behind schedule. She is behind schedule, but the situation may or may not be getting worse.

Clive
Comments  
1 She's falling behind/running behind schedule. (either is correct)

2 She has scheduled a long session for today. (this is correct)

3 How much money is there left to pay on the bill the trimester./is left to pay..
How much money is still owed on the bill for the trimester?
Or: How much money is left to pay on the bill for the trimester?
 Clive's reply was promoted to an answer.