Discrimination in lending - MS

[Jo W.]

A friend of mine is a nurse and unfortunately she has MS, due to her illness she can call in to work with no limit of days. 

She applied for a refinance which will save her a lot of money and got denied because her HR department would not sign a guaranteed amount of work hours as she has MS and can call in whenever she likes. 

Does it sound like a discrimination to you? She is more than qualified (800 plus credit score, DTI ratio of less than 25% and work history).

Are there other options to refinance in this situation?