HI Julia,
I am T1, but I have onl been breastfeeding for 6 months...so a mere novice! To be honest, I know that breastfeeding does affect your hormones, and therefore your diabetes, but in my own case, it doesn't have any more impact than my monthly cycles etc. I was going to sugest that maybe at 15 months, your little gorl isn't having as much milk from you, so the impact that breastfeeding has on your indulin requirments is being diminished? I don't know if it is the breastfeeding itsef that is sending your bloodsugars alittle awry. It is very difficult to say though! My consultant told me to keep my bloodsugar level high (around 7 or 8) before meals. I have to admit, I didn't pay much attention tothis as my control is not so great that I can actually keep it at at a particular level, I either try my best..or I don;t, and then try and get my levels as low as possible without being hypo. My last HBA1C was 7.6, which one dDr was really pleased with, and another said was too high. I agree that itwas too high, but it does show that even the experts are a little unsure when it comes to this. If you have been breastfeeding for 15 months, then I would say that you are the expert in this, and also in what your little girl needs. If you think that the breast feeding is the problem, then stop, and do not feel guilty or bad about doing so. Personally, I would try all the things I could beofre stoping the bf, ie adjusting my doses etc. I really admire you for bothbf'ing for 15 months and keeping your HBA1C down to 7..even if you are not happy with 7 (and I understand this too) it is still an achievement.
Not sure my ramble has helped though!