I have 3 kids, but first 2 are boys and my little girl is four months, so haven't had the little girl potty experience yet. However I think I might be able to offer a few suggestions...
OK so she doesn't like the big girl panties she has... did she pick them out? Perhaps letting her pick ones she likes. Like Dora panties or something. You could also see if they have little silky panties in her size or even those boy shorts underwear. If she's girly maybe something ruffley. Or maybe even trying to find underwear just like yours, so she would feel like a big girl and probably be excited to be just like mommy.
Now with my boys, I used 2 different tricks to get them excited about going potty. I used something called "Tinkle Targets" which are little flushable targets, I have seen them for girls also. But my other trick was putting a few drops of food coloring into the water. When they would go potty it would change colors. Also a good way to learn colors. (2 birds with one stone, lol) Oh and I also rewarded them with stickers which they would place on their potty seat lid.
Other options you could try are maybe getting a doll that comes with a little potty, books to read to her about going potty, even maybe throwing a family potty party when she goes.
With my kids another thing I did was try to make them more aware of themselves by making a stinky face and saying something like "When you go on the potty you don't have to have squishy poopy or pee pee on your bum" As they got about your daughter's age I would have to practically wrestle them to change their diaper, so I also said "Mommy wouldn't have to change a diaper if you went on the potty" Also you may want to ask her every hour or so if she has to go.
I had my oldest boy trained in 1 week!!! (I was thrilled!) He was trained 2 weeks before his 2nd birthday. HOWEVER my 2nd son, took a bit longer. It probably took me about a good 6 months to get him trained.
I would love to know what works for your little girl... as I have an up and coming little girl. Good Luck! :)