If you were successful in making her feel a lot of attraction for you when you first met her, it’s important that she also knows that you are interested in her and aren’t just getting her number for fun.
Many guys get phone numbers from women and never follow up on them or arrange a date.
As a result, many women feel like a guy isn’t a real dating option until she has actually met up with him for a first date, kissed him (or had sex with him) and wanted more.
Getting a woman’s number and texting her doesn’t mean anything.
You can also just keep it simple and say: She will have a little laugh and remember that she felt good talking to you when you referred to her as the lady in red.