All 5 Uses of

however
in
That Summer, by Sarah Dessen

After the separation, however, my mother was a changed woman.
Chpt 2

however = a word used to connect contrasting ideas as when using though, in spite of that, in contrast, nevertheless, etc.

The name had been changed, however, to the Back to School Fall Preview Fashion Show Featuring a Special Appearance by Former Lakeview Model Gwendolyn Rogers; someone had gone around with a magic marker and added on to all the signs.
Chpt 9

Now, however, there were lights spinning across them, blue and green and red and yellow, catching bits of glitter that I hadn't noticed until now.
Chpt 9 *

Gwendolyn's head, however, bowed forward, as if even watching was too much for her.
Chpt 9

There was a strange bond between us, however unintentional: the divorce, the wall, the years that separated us or didn't.†
Chpt 7

Definitions:

(1) (however as in: However, complications may...)
though (or another expression that connects contrasting ideas)

(Based on idea 1 we might not expect idea 2, but this is a way of saying that even though idea 1 exists, we still have idea 2. Synonyms include in spite of that, despite that, nevertheless, nonetheless, on the other hand, in contrastand but.)
(2) (however as in: However much she tried...)
to whatever degree (regardless of how much; or whatever unspecified amount)
(3) (however as in: However you do it, get it done!)
in whatever way
(4) (meaning too rare to warrant focus)
meaning too rare to warrant focus:

Much more rarely (and arguably incorrectly), however can be used to intensify the word how, as when one says "However did you find her?" Grammarians would suggest using two words for that usage: "How ever did you find her?"