the purple pieces are from the pony-wear with jewelry set. (that set came with a pearl necklace) -you have three slippers, the nightdown and housecoat/cape.
Since you have UK stuff in the lot, that bird brush may be Snowflake's. Mine came with one that colour.
Pink ribbon top- matches to so many ponies, seashell, medley, gusty, etc etc
Green flower pick - Rosedust