Hello:
With hospital liabilities there is a chance they won't let her in. Other things to consider - 1. Seeing you in pain may be very upsetting and she could posibly blame the baby for hurting mommy. - 2. Unless she came in right at delivery - the wait could be long and a 3 year old is going to get very restless. - 3. If you deliver at 2AM will you be waking her for the arrival? - 4. You're going to be a little preoccupied and if she keeps asking "where's the baby" or any other question several times over, are you going to be able to stay the calm soothing mommy that you probably are on a daily basis? I mean, most women are not at their best during this time and depending on your delivery, you could handle it all very well or be irritable and trying to concentrate on getting that baby out!
My delivery was smooth but there were a few unexpected complications with the baby once she was out (she got through and is great). Had I of had another child I would not have wanted her to see me cry. Also, my sister-in-law's first 2 deliveries were great and she had the best disposition. She said after her 3rd daughter that had that delivery been her first, she would have never had another child.
You just never know exactly what you are getting yourself into. On the flip side a friend of mine unintentionally delivered her 5th child at home, with her 10, 8, 5 and 3 year old around.
As a pro, she said the delivery was relatively mild but she definitely recommends a hospital without little ones around - her 6th and final was born at the hospital. Her 3 year old kept trying to see what was going on and fortunately her 10 year old was a lot of help.
Personally, it would not be my first choice - but wishing you the best and let us know how it goes.
T.