Mrs Austen in letter 10 is trying to persuade her surgeon to allow her to drink some dandelion tea.

Lyford has promised to call, in the course of a few days,& then they will settle about the Dandelion Tea;-the Receipts for which were shewn him at Basingstoke,and he approved of them highly; they will only require some slight alteration to be better adapted to my mothers constitution

we know from the same letter that Mrs Austen is suffering from an indisposition brought about by fatigue and travelling:

She was a good deal indisposed from that particular ind of evacuation whihc has generally preceded her Illnesses-She had not a very good night at Staines & felt a heat in her throat as we travelled yesterday morning, which seemed to foretell more bile

Dandelion tea might have helped.The leaves of the dandelion were known to be a direuretic.You can still buy it today .ti is supposed to have a powerful action of liver and Gallbladder function.It purifies the blood,increases bile production and improves the function of the spleen, pancreas and stomach.Or so my local health food shop told me ;-)

Travelling in a carriage can sometime create symptoms rather like seasickness.

For example ,the fabulous English Gold State coach( commissioned by George III)and used very rarely, for coronations and special occasions like jubilees ) apparently has an action that makes passengers feel as if they are travelling on a very rough sea.

Many coaches at this time remember did not have the luxury of being sprung on good iron springs.The Gold State coach is hung on strong leather straps to its undercarriage.That innovation only began to be common from 1805 when the elliptical spring was improved upon and introduced by Obadiah Elliott of Lambeth.

Perhaps poor old Mrs Austen really did suffer from travel sickness.

She badly needed some acupuncture bracelets.