Definitely.
Emily is totally plastic, self-absorbed, and boring. If I met someone who said they have no interests in life, I would run the other way. I assume Ricki goes to school all day so what does Emily do? (I don't for a minute believe she cooks or cleans).
She reminds me of the beauty contestants who give incredibly dumb answers when asked a basic question. Then later the clip is played on talk shows and everyone has a good laugh.
And, no, most 26 yr olds are NOT like Emily. Many can converse on a variety of topics, have careers, and are on their way towards becoming (or already are) doctors, dentists, llawyers, designers, etc. I've interacted with teenaged cashiers and fast food employees who have a lot more depth than Emily.
As far as her so-called maturity, there are many girls who get pregnant in their teens and the father of the child disappears for one reason or another. That does not mean they are mature.