Can I cash my mom's check since she was deemed incompetent?

My mother is 61 with paranoid schizophrenia. I was named her POA in 2010 and her health care surrogate in 2016. She was living in a nursing home in WV but has been in ICU on a vent and now a trach for the past month. I removed her from the nursing home so she could go to a place better suited to take care of her needs, and eventually move her to NC with me. The nursing home mailed her check to me. Am I allowed to cash it to buy her some new clothes (trach friendly tops, etc) and other basic necessities?