The analyses of a text #4

The narrator recalls his adolescence.
He is an apprentice for the lawyer Mr. Jorkins.
His grand aunt and her distant relative Mr. Dick came to London after her going bankrupt.
Now, He works as the secretary for Doctor Strong, who lives in Highgate now, in his spare time, who was the head master of the school the protagonist went to.
The local lawyer Mr. Wickfield's only daughter Agnes is his best friend.
Uriah is the partner of Mr. Wickfield and Uriah and his mother Mrs. Heep lives in Mr. Wickfield's house.

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How much of the practice I have just reduced to precept, I owe to Agnes, I will not repeat here. My narrative proceeds to Agnes, with a thankful love.
She came on a visit of a fortnight to the Doctor's. Mr. Wickfield was the Doctor's old friend, and the Doctor wished to talk with him, and do him good. It had been matter of conversation with Agnes when she was last in town, and this visit was the result. She and her father came together. I was not much surprised to hear from her that she had engaged to find a lodging in the neighbourhood for Mrs. Heep, whose rheumatic complaint required change of air, and who would be charmed to have it in such company. Neither was I surprised when, on the very next day, Uriah, like a dutiful son, brought his worthy mother to take possession.
'You see, Master Copperfield,' said he, as he forced himself upon my company for a turn in the Doctor's garden, 'where a person loves, a person is a little jealous - leastways, anxious to keep an eye on the beloved one.'
[David Copperfield by Charles Dickens]
1. I'd like to know if "herself" is implied after "engaged."
2. I'd like to know why it is "rheumatic complaint," not "complaint about rheumatism."
3. I'd like to know what "have it in such company" means.
4. And I'd like to know "brought" meas "got" in "brought his worthy mother to take possession."
Thank you in advance for your help.