As far as I can remember, your friend can't actually be offered the quest for Pharos HM until the quest that requires the Pharos NM clear is completed? What is the name of the quest being offered to your friend right now? Have they completed the Praetorium mission yet, that's the only pre-requisite for Pharos NM that I can see.

After Praetorium, the questline goes as follows:
1) Sirius Business (from Diamanda), the player needs to speak with a Lalafell male named Mimidoa, then another person named Davyd at Pharos Sirius.
2) Complete Pharos NM.
3) Why So Sirius (from Diamanda) the player again needs to speak with Mimidoa.
4) Things Are Getting Sirius, unlocks Pharos HM.

I've got a feeling your friend has Sirius Business active and hasn't spoken to Davyd yet.

I hope this helps~!