No, Ernie and Eleanor weren't there--that probably would've been awkward.

I don't think that Ernie and VM crossed paths after Elizabeth's funeral. However, both Ernie's sons with Eleanor were there--George Donatus was wed (or would wed soon) Cecile of Greece, Margarita's sister.
Wedding guests (based on a photo in a book so it's based on the caption not any precedence):
Philip of Greece; Hans & Peter of Schleswig-Holsten; CPss Louise of Sweden (nee Battenberg/Mountbatten); Victoria Milford-Haven; Sandra, Missy and Victoria Melita; Princess Nicholas of Greece (nee GDss Helen of Russia, Ducky's sister-in-law and Margarita's aunt-by-marriage); Marie Melita of Schleswig-Holstein (sister of groom); Ludwig & George Donatus of Hesse, with Cecile of Greece; Elisabeth of Greece; Irma & Alexandra of Hohenlohe-Langenberg; Berthold of Baden & Theodora of Greece(soon to marry ); Peter of Greece; Ernst of Hohenlohe-Langenberg; Christopher & Sophie of Hesse (nee Greece); George of Greece; Feodora of Leiningen; Emich of Leiningen; various members of the different branches of the Hohelohe tree (Hohenlohe-Wladenburg & Hohenlohe-Schillingsfurst, Hohenlohe-Jagstberg); Rene & Margarethe of Bourbon-Parma (nee Denmark); Karl of Hohenlohe-Langenburg; Friedrich, Duke of Schleswig-Holstein; Kira of Russia; Heinrich XIV of Reuss; Marie of Leiningen (nee Russia); Karl of Leiningen