Can't really tell. It's either that or bacterial. Try an anti-fungal and see if it makes a difference in a few days. Or use something like tetra fungus guard which treats fungus and bacterial.
If it's red around the infection or eating into the scales I'd favour bacterial. Bit wispy and is fuzzy above the scales, could be fungal.
MB should do it. You could half dose to start if fry are in tank. Not sure on other anti-fungal products.
Pimafix you could try but imo I'd skip it. I only find that works if a mild case.
Hmmmmm idk if my swordtail has fungus or ick lol let me know how yours goes
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Ok I put her in the jar and did some research on how much salt to dose and it said 1 tablespoon for every gallon of water and she is in a quart jar so I'm going to put 3/4 of a teaspoon in and I'm going to sprinkle a little in every hour until it's all in does that sound good?
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Sounds good. You might need to take a bit of water out to pre-mix. Should be fine, just do a water change if she starts to struggle with the salt or rolls over. A tablespoon per gallon is a good starting point.
When did the infection start? Eg after a water change?
That does sound fungal. Is it getting any worse or getting more fuzzy/hair-like?
Edit - anything changed in the tank a day or so to noticing? Anything new or filter change or temp change, etc, etc.