If you feed them they will come.

I was merely going to suggest you don't feed them too close to your home so they don't camp out right next to windows.
Your blue eyed girl sounds like she'd be a lynx point.

When you have her sitting a few feet away like that again, try opening up a can of food. If she still keeps her distance, use a spoon or fork to scoop a little out then slowly put it out on the ground (or dish) as far away from you as you can reach - if she doesn't move closer, slowly scoot back on your butt to make more space (you should be sitting, btw). Use a stinky fishy can food.
Keep trying this. That she doesn't run very far suggests that she might not be feral.

You may just be able to get her to come very close or even to you.
When/if she does come close enough to eat from a spoon, let her get used to doing that for a few days and slowly bring the spoon closer to yourself over a course of days.
Never make eye contact.
Is the tortie a recently dumped girl? You could probably catch her in a trap pretty quickly if you do it before she figures out where to regularly get food - she'll be more hungry.
Oh, and if you have any contact with these cats or anything they've scent marked, change your clothes and thoroughly wash your hands (and forearms) when you come inside. Smelling like another cat could easily make Sirus spray you in an attempt to remark you as his.