If you're worried about DD not going to sleep for her carers while your at work you could try rocking her to sleep/taking her for a walk in the pram to fall asleep etc to give her other ways of falling to sleep, that way she won't be totally put out when she's not BFed to sleep?

I've been doing that with DD for her naps and it's working well. I used to feed her to sleep, then wake her slightly before putting her to bed. Then wake her almost fully and rock her back to sleep. Then just rock her to sleep, gradually putting her to bed more awake each time. It's taken a few weeks but there haven't been any tears and doing things gradually works better for my DD.

And congratulations on feeding your DD so long, I also really enjoy BFing my DD, I had planned on fully weaning her when I went back to work at 1 yo, but she really loves it, also for comfort so we'll see. Good luck