She won't lose any weight over two weeks don't worry. Ball pythons can go off feed for 6 months and lose very little weight, so two weeks is nothing. If you think about how much they eat in the wild, feeding once a week is more than plenty.
At this point you should soak her and ever so gently take that band-aid off as mentioned, put more triple-antibiotic on, then leave her alone. Don't handle her or pester her at all with exception to taking her to the vet. Give her plenty of privacy for the next two weeks until you try feeding again (covering her enclosure is a good way to do this)
The brown paper bags are better than loose substrate but white paper towel is absorbent, soft and very easy to see any urates, urine or poo on so you can clean it quickly and not have to worry about it infecting her wound.
On another note, congratulations on your new snake, you are doing the right thing by asking questions and looking for advice to give your snake the best home and care possible
If you have any other questions regarding your husbandry or anything in general, don't be afraid to ask, the members here would love to help you!