Breastfed babies do slow down big time at some point. As long as your dd is still gaining some weight and seems to be active and reaching developmental milestones and has wet diapers, I think that is normal. Just an example, my dd was growing very fast till she reached 6 months, I think she was 17 pounds then. Later, she slowed down and at 13 months check up she gained only 4 pounds more. You see, in second 7 months of her life she gained only 4, compared to 10 pounds she gained in first 6 months.
As for pumping, some women can pump a lot, and some can hardly pump anything even though their supply is great. If you were ill, stressed and tired, it is quite normal that it dropped but you said your dd still had plenty of wet diapers. I assume your dd is on a nursing strike, this can be due to anything like teething, a cold or something else. I understand that you are considering weaning, it is up to you to decide. The truth is that a nursing strike is a good time to do it. I will always encourage you to continue, of course :lol:, and we all will gladly help you if you choose to do so.
Let us know,