Is arm numbness a symptom of ME/CFS?

My sister has developed severe ME/CFS from Long Covid. She's bedridden from debilitating fatigue, has orthostatic intolerance, and has a long list of other symptoms. She's gotten worse recently and has to wear an eye mask and noise cancelling headphones all day and can't get up out of bed at all and can barely talk except for short conversations only in the evenings. Recently she's had numbness in her arms in the mornings/afternoons. We really want to avoid bringing her in to the ER unless absolutely necessary because we know it would trigger a bad crash, and she's declining so rapidly lately that we can't afford for her to get worse -- she could lose her ability to speak completely or she could get to the point of needing a feeding tube. But I'm worried about the risk of not taking her to the ER. We brought up the arm numbness to her GP who said to go to the ER. I don't think she (the GP) understands the severity of the consequences of going to the ER if they just run tests and say 'the tests show you're fine' and send her home, which is what happened last time she went to the ER, a few weeks ago. She would have a bad crash afterwards, for nothing. Is arm numbness a symptom of ME/CFS? Upon a Google search it would seem that it is but I'd like to hear other people's experiences.