Nice one. Sounds like a good interaction with this girl from work. I think your assumptions about this girl are correct, try not to question them. It's always the case that in reflection, when you have time to think, you see things that were hints of interest and attraction that could have been acted upon in the moment!

I think a big problem, which is ego related, is seeking and looking out for IOIs. This can distract you from your interaction and leave you uncertain when the IOIs are not there. As Tom always says 'Assume it's on'.

As for getting down Bluewater for some day game approaches... do it! A great way to lower yourself into this would be to ask directions or if people know where a certain shop is. The day time is a different environment so you need to adjust to people being approachable.