there's no Serbs there, and none of others would pull Greeks to 25% Baltic except maybe Bulgarians.
but the Bulgarians which border Macedonian Greeks are Pirin Macedonian-Bulgarians and they should be genetically the same people as Fyrom-Macedonians, right? So it's not from them either.
but those are independent sources, they weren't collected by you. so if she doesn't trust you, those sources are free of your influence.
People assume that more geographically north must mean more Slavic.
but this doesn't have to be so at all.
In the initial 7th century settlement, Slavic tribes settled mostly in Southern Serbia, Western Bulgaria and North Greece, but for a large part of today's Macedonia we have no information of a Slavic tribe settiling there:
https://historum.com/proxy.php?image...f25c22580bf0bd
according to archaeology a group of Slavs came to Macedonia from Bulgaria a few centuries later.
Davidski has seen the samples of some Slavs from Macedonia, and they weren't Ukrainian-like, they were already mixed and similar to today's Serbs and Romanians.
These could be those migrants from Bulgaria.
so if your averages are really valid, and Macedonians have ultra low Baltic, this is the reason why.