First....not trying to be offensive....but if you want a person with a good medical background to respond....write in true text and not these silly abreviations. I almost had to ask my teenage daughter to translate it...LOL
There isn't enough true information to give you great information. But I can tell you that growths, that are near genitalia, can tend to be hormone related and sometimes do return when the monthly cycle of hormones returns (Such as an ovarian cyst).
You described a cyst that was "drained" and not "removed"...
It sounds like it may have been a bartholins gland cyst. It is a gland you generally don't want to loose if you are young and sexually active since it gives the vagina the lubrication it needs. He did the right thing by trying to treat it without a catheter the first time. He was doing her a favor treating her as a young woman and not interfering with her social/sexual activity. They could be that aggressive with an older post-menopausal woman as she wouldn't be as inconvenienced. It bad luck to ge this sort of cyst...it would just be bad luck again for a complication like a blood clot....and worse luck for it to return. It is no fault of the treating physician. Generally, it is proceedure to just making an incision to drain the cyst and she is healed and back to normal. She was not a normal case....
The drain will be for the purpose of allowing that cavity to heal and shrink without the pressure of the fluid build up to stretch it. If the area is allowed to heal, the fluid will no longer have an area to accumulate and it can develop into a normal gland again (and still function - yippie for her!). If you can explain it to her by imagining a water balloon...if it is allowed to remain drained for a long period...its insides will adhere to itself and not reinflate easily. It will still function but the fluid will go out where it belongs intead of into that cavity.
It seems like an extended period of time, but the longer the healing, the stronger the adhesion....and it is worth the wait to not have the gland removed.
The vagina is generally an open port to infection anyway. Just as you had to keep your periteneal area clean after delivering your child (if you had an episiotomy). She will have to just keep it "clean".
Tell her to be happy it is during this time of year and not when she wants to be in a bathing suit.
Hopefully I was describing the correct condition...I guess more information would help me better pinpoint the proceedure she had.
:)
Tell her I wish her luck!