Having used both MBPs and Airs, I agree that the MBP has more processing power, and RAM to handle photo editing.
However, you have to also consider what's her usage pattern. Does she move around with the laptop often? Does she travel with the laptop much?
The Air is an extremely light, and capable device, especially if someone is weight and bulk conscious. Though you have to account for the external HDD that you have to use to store bulks of the media.
They are very distinct machines, and the decision should be easy.
If she only wants to use it on the desk, or at home, then get the MBP.
However, you have to also consider what's her usage pattern. Does she move around with the laptop often? Does she travel with the laptop much?
The Air is an extremely light, and capable device, especially if someone is weight and bulk conscious. Though you have to account for the external HDD that you have to use to store bulks of the media.
They are very distinct machines, and the decision should be easy.
If she only wants to use it on the desk, or at home, then get the MBP.