She looks 2 horned with a small amount of topknot, but definitely not a big one, which I've only seen on multi horned Hebs. It's quite difficult to see whether she has four horns - you would be able to feel them as small bumps, but they would be in a poor position for 4. A multi horned lamb from two supposedly 2 horned parents is vaguely possible if one of the parents has fused horns so they are 4 looking like 2 - it does happen occasionally. I don't think that will be the case if the pedigrees are all 2 horned - genetically 2 horns can't hide 4, whereas 4 can carry (hide) 2. 4 horns are dominant over 2.
To check if her horns are scurs, see if they wobble - be gentle. True scurs are small bits of horn material which don't have a full bony core, just the outer sheath. However, her horns don't look that small so see what they are like after a year.