Have you started changing her routine yet in anticipation of the baby? I stopped my dog sleeping on the bed, and now he climbs onto the sofa (Grrr) and gets kicked off there every morning.
One thing that may work (not sure if you already do this) is teaching her to wee on command - and then just before bed making her "go". The easiest way to do this is just to start saying a word or making a sound when she goes naturally (we say "WIDDLE WIDDLE WIDDLE! in a high-pitched voice) and then when she finishes her widdle we praise her - regardless. Get into the routine for her of widdles before bedtime.
For our pup (now 20months) we found that letting her inside for a while will settle her, then we go outside specifically to widdle, then straight to bed. This works wonders - no accidents since.
Otherwise, start changing the routine now - if baby's going to be sleeping with you, then do you want Emma sleeping with you too? Set up her bed in the laundry or wherever now, so she doesn't associate the change with the baby.
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