lol at the

You're a fast learner Kathy!
yes, it's a very good point, and one that I had missed as I had seen that 1911 record. (Can you believe that the Irish 1911 census is FREE to view???)
Kathy...I am going to play devils advocate.
The one main point that makes you believe that Mona Dowling is Mona Scott, is because we can't find a marriage, or a death, right? (Apart from all the other little extra's!, which I have to admit, make a reasonable arguement)
What if she DID stay with her newly wed mother, (Which can only be proven by the 1921 census!
) grew up, then left home and emigrated? I have found a few records for a Miss M Dowling travelling in between New Zealand/Sydney/UK. The only detail on the UK incoming list, is that she was born in 1916. It gives a London address, but that doesn't help much either. (She is 30 at this the time of the record I looked at) There are more records, incoming to Sydney/New South Wales, which might offer more details, but I don't have the subscription to look at them in more detail.
If anyone has a world sub to A******y, it might be worth a little peek, if only to rule that scenario out.
Anyway, I think you have done really well, and I suppose we need to wait and see what comes from your new connections. Please keep us updated. That little girl has me haunted...
Edited: Annie went on to have 2 more children, who apparently know nothing of Mona...excuse my muddled, tired brain!