My "analysis" of this paragraph is alot like Rachel G's (although less well put!) I see this paragraph brilliantly illustrating Anne’s discomposure at meeting Wentworth again – all these quick little impressions of the scene are what Anne’s agitated mind is able to fix on. She is too flustered to catch it all.

Rachel G put it much better, with more poetry!

The reader has the illusion of actually inhabiting Anne and experiencing things as she does. She cannot look at him, cannot speak; she can hear but cannot make much sense of what is being said. You share the mental turmoil, and can almost feel her inability to breathe normally. To convey this on film might involve putting Anne's heartbeat on the soundtrack, suddenly increasing in speed and intensity from the moment when Charles says Captain Wentworth is coming, practically drowning everything out while he is in the room, and gradually slowing and fading through "It is over" It is over!.....The worst is over!"