Danmcq did a poll a while back on talking, and age. Here is the link to it
http://poll.pollcode.com/a4R
As for vocabulary, I have no idea how many words phrases Liath says, some things she only says a couple of times and others she says for a few months and then seems to forget or stop using.
Her longest sentence is probably "Aw Do you need a doctor?" usually said after someone, even herself, coughs or sneezes:)