Help needed and much appreeciated on 3 counts

(1) I would like to book my (78 year old) mother a cash ticket DEL-GRU return and then use my miles to upgrade her to Business She is on my household account but I cannot seem to do it online

(2) I am Ek Gold i understand there is a GOld desk in DXB does anyone have the number,, so I can do it by phone. Will tyey accept my Credit Card if I am booking for my mother? Is there also a gold desk in the USA? If so does anyone have the number to call from OUTSIDE the US? (I am in Brazil

(3) Since both journeys involve an overnight stopover at DXB will emirates give her and me both the same quality of hotel once upgraded? (I am flying weith her in Business, on a paid ticket)

Many thanks in advance for help