I note your history & the injection site et al.
While i am happy the podiatrist recommended it, it seems like there is an injection abscess
formed at the site that has slowly turned into some sort of foreign body granuloma
that is still bothering your wife.
Might i suggest a re-visit to the podiatrist or a general surgeon
& a check-xray of the site to ascertain the damage & clearly tell you if something else is on.
It could be one of a host of other conditions or simply that she is stressed out & attributing a tad much to the symptoms column.
Good luck & wish your wife a speedy recovery!
Dr Praveen Rodrigues MD