Help! Awkward situation

Hi all


Could really do with some advice, might seem like a minor issue or that I'm being the biggest bitch but it's really stressing me out. We are getting married in Mexico next year (we live in the U.K) and there is around 45 of us going, some for 2 weeks, some 11 days and some 1 week. We are obviously going for 2 weeks, as is my best friend, who is my maid of honour. So here is the issue...my best friend is single and coming alone and I'm worried she is going to get lonely. We are extremely close and she means the world to me but I'm already getting worried that shes not getting that it is our wedding/honeymoon and we want to spend time alone at certain times. She wants to travel to the airport with us and book the extra seat in our row of 3. My OH works away so we love our holidays getting to spend quality time together, my friend can be quite shy so mixing with other people is tough for her, even though there is other single people going, I know she'll want to be with me rather than sit with people she doesnt know. I dont bother with my phone on holiday but I kind of get the feeling she will be texting to meet for breakfast and dinner whereas these are the 2 times we like to be alone. I'm all for chilling with everyone at the pool, going for lunch etc but certain times we like it just us. I dont want to hurt her feelings but at the same time I'm worried it's going to be the 3 of us all the time, it's making me anxious as I dont know how to approach the situation without hurting her.