AUGUSTA — A mental health worker injured 15 months ago when she was assaulted by a patient at Riverview Psychiatric Center is suing the patient for money to cover her medical bills, lost wages and other damages. Sally Nichols of New Sharon so far won a judge’s approval for a $100,000 attachment on any property owned by Arlene Marie Edson, 33, who is serving a four-year prison term for that assault and three others.