you sound really happy,
starting out in polyamory is always such a jorney, for me it was enlightening an adventure that changed my entire outlook on life, i am a much happier more open loving person because of my lifestyle.
it sounds like at the moment you are all living in the moment and thats great but also its very understandable that you are worried about how you will feel when your new love has to go home, that is going to hurt, it is ok to alknoladge that it will hurt,
it also looks like you are talking about a solution, her coming back over,
there are many options for long distance relationships so it doesn't have to end and for now she is here with you and you can develop things,