Most likely their air is too slow - have them raise the back of the tongue (think ooo with the lips, eee with the tongue), aim the air high, and push it hard and fast. Sometimes it can help to get to visualize aiming the air at the top of the wall in front of them to knock it down onto (whoever they want to visualize behind it).
Make sure they aren't taking in too much reed. Their bottom lips shouldn't be any further down the reed than where the heart meets the windows.
They can push the reed into the lower lip muscle a fair bit to help (NOT lip-covered teeth! the corners must be active so that it's muscle they're pushing into, or you risk both the tone and the reed).
Do check that the reed is giving them a fighting chance, though. When they crow it with their lips at the thread, it should crow between a B and a C, with a good balance of low and high notes in the crow. If they're playing some store-bought reed that crows like a G with no high overtones in it, there's no real way for them to manage the high notes without doing things with their embouchures that they shouldn't do.
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