What do I put on form 2441 if I didn’t pay anyone to provide care for my disabled mother, who I am claiming as a dependent?

My mother lives with me and she is disabled and has not worked. She only receive SSDI. I pay for all of our living expenses and she only pays me a little less than half of the rent, since we’ve lived together. I’m having trouble completing form 2441 because I did not pay anyone to care for her, and this is preventing me from filing my taxes. Any suggestions on how I can move forward?