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I am sorry to hear this.
Yes you can most assuredly sue her. What you should do is send her a demand letter by registered mail and in the letter set out the facts, provide her a deadline for reimbursing you for all the monies she has cost you and tell her that if she fails to comply you will commence legal proceedings and then will be seeking interest and your costs.
You can sue her in small claims court and self represent. If it gets that far and you find you need some help as you go through the process you could always post on the site again and I can assist you further.