asking for a nappy for poos

Hi just a little advice needed. My just turned 27 month old daughter has started to ask for a nappy back on to do a poo.
Brief history... was using the potty daytime 100% for wees (wees for about 6 months) and 100% for poos for a few weeks. Anyway, she has just started asking for a nappy on, so she can do her poos. She doesn't wear a nappy in the day at all, but when it comes to needing a poo she says 'nappy on please mummy' and tells me she wants to do a poo. I ask her gently if she would like to use the potty but she says no and keeps asking for a nappy if I take my time getting one, so I put one on, as she will hold it in if she doesn't have a nappy on. She was doing poos in the potty without problems previously, and was very happy to do so, had no pressure from us and she used it without needing to ask her. She did have a tummy bug (slight Bali Belly!) and it caused her a bit of pain when going so I think this put her off and thats when she first asked for a nappy on, so we didn't want to say no. That was back at christmas time. She is not constipated and hasn't been. (She has nappies on at night for bed, not ready to go without)

I must stress that she has never been put under pressure to use the potty, and we have never used negative words about the potty or nappy changing etc. When she has her nappy on, she then says 'I am going to hide mummy, do poo', and goes to this little area where we can't see her. I am not sure why as we have never embarrased her and even as a baby never said to her that her poo smells or anything like that. The 'little area' she goes to has her potty there too, and she does her wees there, and was doing her poos in the potty there. When she was using it for poos, we actually asked her she would like her potty and she chose their and was happy with that. We have asked her if she wants it somewhere else, or if she wants another potty somewhere else. She understands everything, so no trouble there.

so any advice? or is it best to just leave her, and keep putting a nappy on for her poo? I am not worried about it, I would just like to know others opinions, I'm I doing the right/wrong thing by putting a nappy on? I don't want to pressure her at all

Is it embarrassment or pain? A suggestion I read once was to paint a "magic stick" and tell her that when she holds the magic stick, the poo will not hurt/not be embarrassing or whatever the issue is. If she wants to be on her own, perhaps you could put her on the potty and close the door, leaving her on her own. Good luck!