The Methodist Home in Durham, NC, successfully replaced some gerichairs with bean bag chairs at the nurses station. Gravity keeps the patient in the chair while she is free to move around without falling. Bean bag chairs are easy to clean, simple to move, and comfortable for sleeping. These chairs may be difficult for some patients to get into or out of. She's looking for attention.
Reassurance is the best response.
We love you, Mrs. Jones, and we'll help you. Give her something to fiddle with in her hands to distract her from pulling on or tearing her clothes. If she pulls up her skirt regularly in public, have her children get her some pull-on slacks. Don't ask her to make decisions or ask her what's wrong. If you make decisions, she's relieved of that taxing responsibility.