Recommend 42 - 44 cm CX bike / frame

Hi,

      I am lookig to get my girlfriend a new bike as Christmas present. She wants to get it to CX racing for a while, so I think it will make a perfect present.

Problem is sizing. Most of manufacturers don't even do frames below 48 cm. She is 150cm tall, so frame needs to be very small. But not junior type, those normally come with 650c wheels and are generally heavy.

Since we are speaking CX it means disk breaks mounts and relaxed geometry for more upright position.

Any sugestions please?