Kid bike or adult bike

So: daughter now grown out of her Ridgeback MX24. She's nearly 11, just under 150cm tall, and I'm wondering if a small adult bike would be appropriate rather than a large kids' bike?
Flippin' kids growing mumble groan
Flippin' kids growing mumble groan

It's just a hill. Get over it.
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But... If money is tight and you can't afford to purchase one at a later date, or don't want to, it might be better to get the larger bike.
In terms of looking adult, or childish though? Children always want to seem to look adult. So that should factor into your decision as well.