I know that this is following up to two years of horrible Covid restrictions, but I think that you should forego going abroad for one more year. I don't mean this because of Covid, or all of it's possible ramifications, I mean because I think that with your DD being 16 (and ½ by that point), it is just a little bit too young to be leaving her for a whole week, to go abroad. Add in that she is not nt and has no other family close by, then my advice is a definite no to going abroad - even if just hopping over the channel, it could easily take 4+ hours to get back home, maybe even a whole day, depending on transport: trains, planes and automobiles, plus possibly ferries, means to me that you are just too far away in either a DD emergency, or a DHouse, or Danimal emergency!
If I were you you, I would go away self-catering, but no further than the nearest bit of coastland to you, even if that is Blackpool/WsM/Skegness or similar. If you happen to live by the see anyway, I would say no longer distance away than 1½hrs, and closer if possible.
In the 1950's hardly anyone went abroad for their holidays, and we still still had a brilliant time. Now in my 60's (agewise), I have been abroad on holiday a total of 7 times in my life. I go on holiday every year (beginning of March 2020, and September 2021), often 2 to 3 times, but I haven't been abroad since 2003.
I love holidaying in Britain, I have stayed in all 4 of our Countries, and multiple places in England (sorry I just realised that I didn't count a weekend in Dublin as being abroad, so abroad 8 times, last time about 2008), and still to all 4 of Britain's Countries. We live in a beautiful United Kingdom and Northern Ireland. So I feel that I can safely say that if you live in any of our 4 Countries, you will still have a great time. I really think that you can spend one (more?) year holidaying at home.
Not only would staying reasonably close to home be advantagious for emergencies, but it would also give your DD her week to herself under what I consider to be much safer circumstances - so I see that as a win win situation.