<human>: Can you condense the text into a few key points?

So I'm an aspiring filmmaker and I finally got to film my first short film. I've worked so hard and saved my money to finance everything myself. The cast and crew totaled to about 7 people in which I agreed to pay them. 

It was a 3 day shoot and was extremely taxing and stressful. However, in the end I absolutely loved the experience and learned so much. 

When everything was all done I hand wrote individual thank you cards to each person involved in the project. 

This particular thank you card was sent to the actress: "I was very lucky to have you in my short film. I had a lot of fun working with you. I think your a very talented actress. I wish you the best in your future." 

My girlfriend saw and read that card and she was livid. She claims by writing "I had fun working with you" it's considered as flirting and it's essentially an invitation to want to see here again. She also says it's not professional. 

Now keep in mind, I wrote other cards stating, Thank you, I think you're an amazing talent, hit me up anytime, I appreciate your time, etc. All to the other cast/crew but my gf had no problem with that at all. 

I wanted to be slightly different than the others, in the event one of them post my thank you card on social media. I didn't want it to seem like I just copied and pasted. I wanted it to be personal because it meant a lot to me from each person to help me with my dreams. 

I've kept all my text messages and email conversations and showed her how I've been responding. And it had always been professional. 

How can I address this?
<bot>: wrote a thank you card to actress I worked with and now gf is upset because she thinks I was flirting with her.