addendums are always in most markets the responsibility of the agents to write..

Make sure the tenants will be responsible for the utilities otherwise you're going to have to factor in getting the place sub-metered for electrical/water (if it isn't already), which can be costly. 

On the big minus side, of course she could manage to default again and then we'd be responsible for kicking her out.My questions: is there any way to reopen the case with her upcoming income?

Read the instructions on how to fill out schedule E.

Our lease says the tenants are responsible for water, sewer and trash.

Gauge the tenant's response and proceed accordingly.

Thanks in advance for your responses!

Like all businesses the owner is responsible for choosing the direction of the company (your name in RE).

Thank you for your response.

If you’re takin pets, add a pet fee, put “PET FRIENDLY” as your first headline words, inspect monthly for the first 4 months, expect a surprising number of “im a dog trainer so my animal is exceptional” responses since calling yourself a dog trainer is as easy as grabbing a saw and calling yourself a carpenter, and ALWAYS meet the animal - preferably at the showing so you see how it reacts in a higher stress situation of new people and new noises etc.