Sudden decrease in morning supply?

Hi Everyone,
I am hoping someone has had experience with this and can help me!  I used to pump 9-12 ounces every morning before work, sometimes less if LO was feeding at night.  I am a teacher, and just came off a long 3.5 week break a couple weeks ago, but I still pumped every morning and made a couple of bottles.  Since I have returned to work, I am only making 5-6 ounces each morning!  And it takes a long time to let down, and pump! I do not make up for it later in the day, which leaves me tight for milk each day.  Some other facts:

-LO is 8.5 months old, but 7 months adjusted.
-LO is eating solids, but just two meals a day that are 1-2 ounces each (she's not a fan).  I have continued to pump the same, though.
-I have two pumps, one at home and one at work.  They are both Amedas, and if something was wrong with the one at home (that I use in the am) I would notice that I pump more at work, but I do not!
-I eat, drink, and do all of that other healthy stuff well, and have been.
-No new meds or antibiotics for me.
-LO did get a yeast infection at about the same time, but I cannot see any connection.

Thanks for any help you ladies can offer! Overall, I used to get 25-30 ounces each day.  Now it is 20-25 and I added in a pumping session. I just don't want to make myself crazy!