Silverstream, no offense to anyone, was a little bratty and spoiled. She was Crookedstar's daughter and Graystripe's mate. She was a good cat, but why don't you think about her true personality?
"How can our love do any harm?"
Silverstream said this line, and RiverClan and ThunderClan almost went into battle because of Graystripe's kits, Stormfur and Feathertail. Graystripe left his home Clan and best friend to join his mate's Clan no matter how homesick he felt, and Silverstream died of blood loss.
Sure didn't do much harm.
Silverstream thought she knew everything and could do whatever she wanted just because she was the daughter of RiverClan's leader. Silverstream called Graystripe a mouse-brain and the two are instantly in love. It was a good thing that she saved Graystripe, but it was kind of stupid for the two to be instantly in love.
Of course, Graystripe was involved, too, but that's for another rant.
Silverstream could've been mates with a RiverClan tom and avoid all of this mess, but no. She was stubborn enough to ignore her father and meet with Graystripe anyway. It ended up killing her.