Here are some links on FMP.
India Office records:
Seraphina's inventory:
https://search.findmypast.co.uk/reco...-AG-34-27/4637
Accounts of her estate:
https://search.findmypast.co.uk/reco...-AG-34-27/4639
which says that Harriot was brought up by a Mordaunt Riketts Esqr after the death of Captain Slessor.
Seraphina's will:
https://search.findmypast.co.uk/reco...-29/WILL/71765
(I'll type out a transcription in a minute)
and an entry in the Index to Death Duty Registers 1884, showing Harriet Bazett as administrator:
https://search.findmypast.co.uk/reco.../DDUTY/1824564