Pursuing a girl

Since women aren't one size fits all, the degree of interest, respect, etc. cannot possibly be predicted.

Should you pursue? Maybe. If this woman is committed to someone else, then no. If not, then perhaps. Pursuing can take several forms. Most people, I think, will welcome some attention. Following along in your car at night while she walks home from the bus is probably taking it too far.

If I were her, I'd wonder about the lack of communication. Frankly, I'd be a bit pissed at someone who only maintained contact with me if they felt they could get something out of it.

Yup - making assumptions can really mess you up - unless you are a mind reader.

Stop thinking so much about what you THINK other people do/say/want and start getting your own needs met. Prepare yourself to not be so sensitive.
Women like confident, friendly, respectful men.

Ask this lady for coffee or a walk TODAY.