Have to chime in here - we saw Penny Glass twice for our daughter who was about 18 mos. old at the time 2005/2006. Our DD had multiple delays and our pediatrician sent us to see her. I had a similar negative experience as others have reported. Left that visit nearly in tears. I found her to be very cold, clinical, unsupportive, critical of our parenting - in short I felt demoralized after those appointments. Her advice, to focus on speech therapy, wasn't incorrect, but the negative effect of the visit wasn't really worth it. I wonder if she has just been doing this for so long that she forgets that she is speaking to very, very worried parents. It's actually a criticism I have of several departments at Children's. Sometime I think they are so concerned with the health of children in a broad, abstract, academic way that they forget that the little person in front of them is an individual and that that little person's family are individuals with very real feelings and anxieties about their child's future.
We did get help through DC Early Intervention and qualified for therapists to come to our home (this is dependent on how delayed in any area the child is) - all completely independent of anything Penny Glass had to say. IF there is something wrong, the earlier it is diagnosed and therapy begun, the better. DC Early Intervention is now called Early Stages. Here's a link:
http://www.earlystagesdc.org/
I suppose my advice would be to keep the appointment with her, but don't expect anything resembling warm and fuzzy.