This is also unique to Mark, who said that Jesus asked or questioned his disciples (καὶ ἐπηρώτησεν αὐτούς) about what they were arguing, disputing, or discussing with the Scribes (Τί συνζητεῖτε πρὸς αὑτούς). However, there was no indication of what they were discussing here. Perhaps it was about the story to come of why the disciples were not able to cast out the evil spirit.
Matthew, chapter 8:14, and Luke, chapter 4:39, have something similar, almost word for word. Luke was more dramatic by having Jesus stand over her and rebuke the evil spirit. Mark said that Jesus came in (καὶ προσελθὼν). He took or touched her by the hand and lifted her up (ἤγειρεν αὐτὴν κρατήσας τῆς χειρός). The fever left her (καὶ ἀφῆκεν αὐτὴν ὁ πυρετός). She, then began to serve them (καὶ διηκόνει αὐτῷ) with her normal hospitality. This was a typical healing that took place with a touching hand. The mother-in law of Simon was cured so well that she was able to resume her normal activities.