Hi
I agree with Inet that in these cases often it is simply a case of looking through the marriage registers for 'possibles' and then narrowing it down. This used to be a case of going up to London to the FRC. But as she (or he?) says, the indexes are currently free to view on Ancestry, which is such a boon to Family History researchers.
To start you off I loked through a few quarters, but to my surprise found there were quite a few Louisa Dyer's, (at least one per quarter on average) so this method will not work in this case.
Do you know the deaths of her parents Charles and Louisa? If so, and if they left wills, then the wills are likely to list all their children, and depending on when they made then, they could well give the married names of any daughters.