What are the proportions or measurements of where an attractive hairline begins for females?

You can lower your hairline with surgery but to understand how it may actually look or to understand realistic expectations, you need to see a doctor in person and have this conversation. Forehead reduction surgery or hair grafting transplant can both lower your hairline.  It would be in your ...

It is unfortunately difficult to answer your question with the limited information you have provided, no pictures, no exam findings, no location of the hump, or history of why it formed or what may have caused it.  You also did not mention any tests that you might have had.  Bumps can be due t...

To find out where your hairline belongs, lift your eyebrows and look to the highest crease in your furrowed brow. Your center hairline should be about a finger breath from the highest crease

The cost of cosmetic surgery differs from doctor to doctor / from clinic to clinic.  It is best you see different doctors for consultations.  Also consider that cost is not always related to the quality of work or results.

In you case a small incision along the hairline or just behind hairline, 5 cm in length may be all what is needed for correction (shaving with bone bur) of deformity. Although it may be possible to do it endoscopic the location and length of scars (incisions) is similar. I would...

You would need to see a doctor for an examination and understand if your goal is attainable.  There isn't much you can gain without an examination.