Look for an old Ithaca M37 in 16 or 20. They load and eject from the bottom. I went from that to a Browning BPS which also loads/ejects from the bottom. The safety on this gun is on top. I'm not a lefty mind you but can't see why they wouldn't work.

cut and pasted that from a quick google serch.
Rem 1100 comes in a lefty youth and i think browning might have one. Might put the word out at Kenmore that your looking for one. Nice thing about youth guns is they don't last to long. Drake won't be shooting his anymore after 2 years and Alie likes her new pump. Kids grow to fast. If it wasn't for Dogfish she probably would have never killed anything with it.
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When Ma Nature decides to make ya her bitch, aint nothin your gonna do about it