I have an employee who has been on maternity leave and will return to work in a few weeks. She has told me that she wants to continue to nurse her baby once she comes back to work. Ask your employee what she envisions. Do your homework and ask your human resources office for advice. They may have some good ideas about what other companies are doing.
Many companies allow their employees to nurse their babies at work.
You just have to find them. This will help you to determine what is best for your company and this employee. I work in a large office building that has public rest rooms. One of my employees complained that there were terrible things written on the bathroom stall door in one of the rest rooms. She is very upset that no one has done anything about it because she reported it several weeks ago.