J.F.
Don't stress about not giving enough "solid food" to your 6 month old. Her system is still getting used to the new additions and isn't prepared to have too much too soon. As time goes by, she'll indicate that she's hungry and that the breast milk isn't enough. Watch for those cues and introduce a little at a time. Nursing when she wakes up is a great idea, and then attempting solids perhaps mid-morning before nursing is also great. What worked for my kids was introducing more solids slowly during the evening around our meal-time so that our kids were at the table with us, and then nursing right before bedtime. This helped to keep their bellies full the older they got and we found that they slept more comfortably, and for longer. Good luck!