日本語 Japanese Ask Questions Thread 4

If you have a question about the language, ask it and fellow 4channers might see it and answer it for you.


Japanese Ask Questions Thread2
http://dis.4chan.org/read/lang/1206158123/1-40

Japanese Ask Questions Thread3
http://dis.4chan.org/read/lang/1267485093/1-40

What is the difference between saying:

最近、彼女は変になる。
and
最近、彼女は変になってきた。

I would guess that the first case means, "Lately, she is becoming strange," and the second one means, "Lately, she has become strange." "ってきた" means that something has happened, right?