What you need to worry about here is Infection...
If you got any type of "discharge" or exudate from it then it's definitely clogged, but what you don't know is "why" it's clogged...In every case of a clogged preen-gland that I've seen it was due to either a Bacterial or Fungal Infection, and was treated by simply cleaning out the gland itself (a few had to be "lanced" in order to purge them), and then doing warm compresses several times a day on the gland itself to keep it from becoming clogged again, along with both a topical antibiotic cream and an oral antibiotic, such as Cephz...
In the few cases of tumors or cysts that I've seen, the entire Preen-Gland has been extremely swollen, the entire gland usually swells-up like a balloon...That's not what your bird's looks like at all...It looks to me like it's infected and became clogged due to the infection, and the discharge usually comes back as being a mix of Purcellin (the oil that is secreted from the gland), white blood cells, and bacteria and/or fungi...
So I would be getting her to your Avian Vet ASAP because the last thing you want is for the infection to spread/become systemic, etc. She is most-likely NOT going to need "surgery" in the general sense, but at most probably a little Iso-gas to sedate her so they can properly clean-out the gland (they may want to lance the gland as well so they can fully purge it and also get a culture to send-in), take a swab to culture/gram-stain and look at under the scope to determine what medication to give her, and then she is going to have to be on antibiotics for a while.
I wouldn't worry at all about surgery or high costs from the Vet at this point, as that's not what it looks like, and honestly you really do need to get it cultured and get her on the correct meds soon, because it's quite infected. It's when you don't take them and the infection spreads that things start to become expensive, because the infection has spread and now the entire gland needs removed, and she needs IV/IO antibiotics, hospitalization, etc. So I'd get her to the closest CAV or Avian Specialist to you as soon as possible to nip this in the butt quickly...It's probably a very simple and cheap thing right now, but it does have the potential to become much more involved and serious if it's not treated soon...