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I don't know if I should choose glass or something softer like the silicone
I would start with fingers at first. They are free, you already have them, and they will work better, plus you need to see if she can learn to enjoy it. After that, as far as toys, go with silicone. It is the best for cleaning and it will last for a long time. Something the size of your finger maybe bit bigger would be the best.