Hiya Mel.
I pretty much fit those criteria, although I'm around 13.5 stone now, but I started out at nearly 15.5 stone. But I am 5'4" & 30-something. I won't say exactly what the something is, but having dieted several times before, I can say with absolute certainty that my age is against me this time around in losing the weight.
Also, I have an almost 2 year old, and my body shape changed hugely after I had him. So before I carried most of the weight on my bum & thighs, and the weight dropped from them with a bit of walking. This time around I have it much more around the middle and upper body/arms/neck area etc and it sometimes feels like it's not shifting from there at all.
I'm aiming for 7lbs for the month of June, but my weight loss has actually been only a little over half a pound on average for the last few weeks, so the 7lbs seem a bit unrealistic, but I won't know unless I give it my best shot.
How has your weigh loss rate been recently? Has it slowed down a lot? Did you start out with a big loss and then almost nothing for weeks on end?