It's quite warm at the moment and wet in many places. A bit of weather ie wind and rain on your sheep will allow the natural structure of the fleece to re-establish, and she will produce naturals oils in response.
Advice not to brush your sheep might be because in some breeds such as Hebrideans, when showing, the sheep must not be brushed and can be disqualified from the show if it is. On the other hand, Jacobs have a special class for brushed sheep. It makes them look like brown and white clouds and wrecks the fleece for spinning. I can't remember any discussion here on TAS about brushing sheep in any other context.
Try brushing her face if you want to pet her, and scratch her behind her ears and under her chin which many sheep enjoy