At last I got her! This 1989 Elilin doll is a desired item and she is difficult to find, especially in a good condition. She represents the eponymous character of Idol Densetsu Eriko - and, at the same time, the real singer Tamura Eriko.
Mandarake attributes this doll to Agatsuma, a toy company; however, the box only says Pinocchio. The doll was available in three oufits; the yellow one is Eriko's signature look, and while I've occasionally seen the pink one, I can't remember the blue dress in the show.
Her head and her upper and lower body parts are made of different kinds of vinyl - at least, now they are all different in colour due to ageing. Her knees and elbows don't bend.
The box is torn inside, because the accessories were attached to it and the previous owner tried too hard to unattach them. The accessories, apart from a doll stand and shoes, are: a casket, a star-shaped wand, a mike and a mike stand. Eriko can hold these objects in her hands and use the mike stand to recreate stage scenes.
The doll is more or less compatible in size with the series of magical girls by Bandai (1 cm shorter, actually).
The doll itself might not be top quality, but she is rare, and it's a real treat to have her in one's collection.