moh wants to get married right before me at destination wedding

Hey everyone! I recently got engaged and set our date for June 2020. Last night I asked my best friend to be my MOH. She happily accepted. The she asked me how I felt if her and her boyfriend (they are not engaged), got married in Germany (where boyfriend is from), in April or May of 2020. She would want me to be her MOH. I told her that would be nearly impossibly because my fiancé is an account and is SUPER busy during tax season (January-May) which she knows. And that we are trying to save our PTO for our own wedding and honeymoon. And we just can't take a huge trip to Germany right before our wedding and I already told her I wanted my bachelorette party to be in May. I asked her if she would be willing to wait a little longer until after my wedding so my fiancé and I could go and have more PTO to use. Her boyfriend is really wanting to do it in the spring. The whole situation is really stressing me out because I told her we can't come if it's in spring but I also want to stand by her side on her special day. I guess I thought it was kinda inconsiderate to plan her big destination wedding right before my wedding since she knows we are trying to save our PTO our own honeymoon. I know its not my decision about what they do but it was a huge shock when she told me. I probably shouldn't be stressing too much because they are not even engaged yet but who knows, that would change any time. Not sure if anyone has advice but I need to get that stress of my chest. Has anyone else experience a similar situation? If so, how did you handle it?