Both would be, but I would recommend mime jr. over ralts. The reason why is because a mime jr.’s psychic abilities are a lot easier to control than a ralts, as young ralts are often overwhelmed by the emotional feedback surrounding them. Additionally, mime jr. controls its powers consciously and often engages in exercises to develop them, so your daughter may be able to copy your mime jr. and build control by learning from those same exercises.
Of course, it also wouldn’t hurt to ask Sabrina herself. Sabrina is a talented psychic who would know which would better fit your daughter, partly because Sabrina has an intimate understanding of psychic abilities and partly because Sabrina also have precognitive talents.
Best of luck, anonymous!