The best is to use her name.
Write it in a calligraphic form.
Meditate on her name internally.
You can as well associate her name with a specific quality you would like to invoke:
Or use any other quality you would like to invoke associated with her.
You can link her name with a a goddess name like Shakti or Tara.
Now remember that you can’t get it wrong.
Her spirit is intelligent and does recognize your intention.
So, don’t worry too much about technicalities.
If you invoke her, she will hear you!
To your Yoga!