Dc5 has a close friend aged 6, I'm also good friends with their mum. They rent on private land and the landowner has a covered pool next to their house. It's covered with fabric that is coming untied and has been unused for years - apparently it's full of dead creatures and gunk.
Where my mum works there is also a pool with a fabric covering. Ex-SAS co-worker says they are a deathtrap - that even he would drown if he went across the covering and capsized as they stop you being able to swim.
Friend of DC is well behaved and his mother isn't worried about friend going near it, and stores several toys next to it. Older sibling has even run across it in the past.
My DC is a daredevil. If told something is dangerous she almost wants to do it more to prove she's brave.
Before I realised this pool was so accessible (not sure if it's lockable) DC went round for playdates without me and it's been fine. My DP has since told me that he found DC and friend next to the pool during a house party there and when I was last round there, they went to it again to get out an electric ride-on. My friend wants her to come round again and I've been putting it off for ages as the whole thought of that pool brings me out in cold sweats.
What do I say to my friend? I don't want to offend her - I just know my DC can NOT be trusted near something like this. I want to keep both the friendships going and this stalling is making it very very awkward.