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clipon
I'm pretty sure the ratios are 4:3, 1:1, 3:4 giving uneven steps between gears (epicyclic gear box).
It might be worth checking the maths - 46/19 should give 87 65 and 49GI which could be quite usable, depending on the full implications of "a girl who isn't a very good cyclist".
I'm finding 91 69 and 51GI about right (55 yr old / 85 kg male on the Clee Hills) but given how cheap and easy it is to change the sprocket (search YouTube, disconnect cable, remove wheel, remove spring clip, take old sprocket off, place new sprocket on, replace spring clip, replace wheel, reconnect cable, adjust cable) I'd be tempted to leave the front end and tinker with sprocket sizes until your girl is comfortable and approves - there's little point in gearing you think is correct if it doesn't get used (voice of experience - Mrs. E and myself disagree significantly over ratios and correct use of gears)