If this is a temporary solution you could use the laptop with the network card disabled.

If this isn't a license issue the price of replacing the laptop would be way less. The model you mentioned previously sells brand new for $900 or less. I saw some refurbished models for ~$300.

Is her new firm providing her with a laptop? It strikes me as odd that law firms have a BYOD policy when the data that is stored on them is sensitive and proprietary