Answer:
Implement her work
Step-by-step explanation:
The best way to acknowledge her work would be to choose one of the designs that the designer has made and implement it as the official logo for your company in as many places as possible. Once you do this you can allow the designer to take pictures that she can then use in her portfolio as a satisfied big-name client. This can open up many doors for the designer as other big-name clients can then see her portfolio and know that she knows how to meet their demands successfully and provide real value to the company/client.