Pen,
I hope you did care and CALL this bird, texting is such a pu$$y way of setting up future dates etc. Every other bloke sends a text, what distinguishes you, if you do the same? Call her, talk for 3 minutes, she will realsie what a GOOD (not nice) guy you are, then has to give you an answer to your invite to hook up and is likely to say Yes (especially since you have had the balls, which few English guys have by calling her).
Another thing that worked for me, was my rule
That if I got a phone number from the weekend, I would always call on the Wednesday.
It gives them time to think, wow, why hasn't this guy called and plus it sets the tone, you lead a life and will fit her in when you can.
If you get an answer message on your first call to her, don't worry, I would always leace a message along the lines of
"How rude...I give you a call and you put me through to answer phone, not even (Insert:name of famous good looking lady) does that to me, but hey, if you call me back in 10 minutes, I will let you off..............with buying me the first drink"
As for fat women, seriously if your not into them..leave them alone. Your not desperate, so don't settle for nothing less than a good standard. People will associate you with the women you are seen with, and in their eyes you will forever be that bloke who can only get fat birds (thats what they think) but if your seen with good quality. You will attract good quality. ITs alll social proof and practice.
Let me know, how its going