Can I buy a original Apple charger

I'm assuming you mean MacBook Pro rather than the desktop Mac Pro.

You can use the following to identify which power adapter works with her model. Find the right power adapter and cable for your Mac notebook - Apple Support

You can buy the appropriate adapter online via: https://www.apple.com/shop/mac/mac-accessories/power-cables?page=1&f=adapter-apple&fh=4595%2B45b0%2B3214

If you are still uncertain about the correct adapter, reply with the model year of her MacBook Pro (from Apple menu > About ThIs Mac).

From my previous post:

If you are still uncertain about the correct adapter, reply with the model year of her MacBook Pro (from Apple menu > About ThIs Mac).