This is a real problem and the implied modification question is the right one to be asking. I cannot answer it for you, a real estate attorney who handles distressed debt in Georgia needs to look at what the servicer said and how the borrower understood it, because state law and the specific language both matter here.
While you get that call scheduled, a few things are worth having ready. Pull every piece of documentation from the servicer: call logs, notes, any written follow-up they sent. Get the borrower's account of the conversation in writing if she is willing, even a simple email where she describes what she was told. The gap between what the servicer said and what the borrower heard is often where implied modification claims live.
The thing you may not have focused on yet is your servicing agreement. That document should define what the servicer is authorized to do without your approval. If "courtesy outreach" is not explicitly permitted, or if it is permitted but with limits on what can be discussed, you have a clearer record of the breach. That same agreement will tell you what remedies you have against the servicer if this gets messy.
Four months into a non-performing second in DeKalb is still early in the resolution timeline, and this kind of servicer miscommunication can complicate every path forward, modification, short sale, or foreclosure, if it creates a disputed understanding with the borrower.
One piece of general context: Georgia is a non-judicial foreclosure state, which affects timelines, but it does not simplify the implied agreement question at all. That part is purely a contract and communications analysis.
What does your servicing agreement actually say about borrower contact authority?