Does sound more like an E.
Hmmm....She could be an F. Does she try to solve problems from "this is right and this is wrong, therefore..." (an F) or "this comes from a more objective source and this from subjective, therefore...." (a T)? If she is religious it could be difficult to differentiate, as religious people usually will include their beliefs in decisions, which can come across as "this is right and this is wrong". A tip here could be, is she easily swayed by emotion? This could be generalizing, but I have a thinker sister and a thinker friend, and neither are easily swayed by their emotions, whereas they are more receptive to things like facts and statistics. (I generally avoid arguing with them because of this, haha. They are both ESTJ, and both very intelligent and informed about their topics, and stubborn in their opinions.)
I agree with a previous poster that she sounds like an ENFP and not an ENTP. The writing part did it for me; my dad is ENFP and feels the need to have things down in writing (he calls it his "paper brains") whereas my ENTP sister has never been big on writing, though she can, and quite wittily when she wants.
Does she have any "creative genius", so to speak? This doesn't strictly apply to art, it can be seen in mechanical ingenuity or in general being a creative problem solver. It may seem trivial, but I think her curiosity and the legos would mean she is a little. My dad and a friend (who is also ENFP) both are really into figuring out how things work and making new things and combining things into genius creations. (As an INFP, I was also curious, but I somehow never possessed the ability to put things back together after having taken them apart.) X)
ENFP's are really "git-r-done" type of people, or so I've read (and observed.) Does this fit her at all?
(I also feel obliged to add that femininity and sociability are not directly related to the F-type or the E-type, though they certainly go together often.)