HELP! Its complicated- Suing renter issue (details in the post)

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We had a renter who had to end her lease 1 month early. We thought that since she had always paid rent on time, that we trusted her and allowed her use her security deposit as last month's rent. 

I know- STUPID move on our part. 

However, when she moved out, she signed our agreement stating that she agreed to be financially responsible for any damages beyond normal wear-n-tear.

We inspected the unit and noticed damages of over $1,000.00. She also acknowledged that she didnt clean the apartment as required.

She moved out in Nov 2016 and we sent the bill in Mar 2017 (due to having to deal with personal health issues and etc). She is now refusing to pay.

Do we have a right to sue her in small claims court since she did sign that agreement?? Would our argument be valid even if we sent the bill in March?

Btw, we live in MN and have read the renters rights there but they still don't answer this.

I just emailed a lawyer too, so hope to hear from that person soon.

Thanks, everyone!