778 TransUnion credit score but high balances.

I am new to landlording and this is my first time reviewing a credit report.

Rent: $1,100
Monthly income (before tax): $5,500
Credit Score: 778 (did not miss any payment in last 3 years)
Min. Monthly Payments: 550 (which includes a car payment and the min payments on credit cards)

However, all the credit cards are pretty much maxed out. She was out of job for a few months and just started a new job last month which could explain why. I talked to the new employer and they were very happy with her. The job is a full time job with all benefits and everything.

Rent/Income ratio is fine and so is the credit score. I am worried about her high credit card balances. I like the tenant as a person but i am new to this and not sure if this thing is a straight NO-NO in the books of the experienced landlords here.

Thanks in advance. I really appreciate some advise.

TK