I'm applying for Ph.D. programs so I requested a recommendation letter from one of my supervisors in my master's program. She directly sent me a strong recommendation letter in the email but said she has no time to upload it online.
The thing is her daughter just had a premi baby and she needs to take care of them. I worked closely with her and she is well-known in my field. Her recommendation letter will be really helpful. What should I tell the schools I'm applying for? How should I explain my situation?