No champ shard

''we have enough mastery 7 rivens, so we decided to stop giving out her champion mastery tokens'' - riot

have you upgraded her to six? and have you checked your loot inventory?

You don't get champ shards from getting S ranks, do you mean mastery tokens?

And if you do mean mastery tokens, are you sure you're getting you S or S+ ranks in regular Summoners rift (normals or ranked)? You can't get mastery tokens in other game modes.