S.T.
LOVE that she plays 'let's pretend' (i worry that it's dying out what with kids all coming complete with screens these days) but i would not cater to being part of it all day. it's nice that you want to play with her, but you can put brackets around it. there's no point in all this guilt. she's an only child, and there are HUGE advantages to that. one of the biggest is learning to entertain herself. any let's pretend game can be done solo, and there is zero shame for any mom to be able to say firmly 'mommy's time for playing this game is up. i'm busy now and you need to play with pretend kitty' (or substitute pretend kitty's name.)
once kids cotton onto the misdirection ruse, it just insults them. she's probably outgrown it. just be upfront, firm and kind with her.
khairete
S.