Your bunny should not be eating any bread or potato. Also, most grains, such as wheat and corn, should not be given to rabbits. Small pieces of carrot are okay, but you have to limit them due to the sugar content. The bulk of your rabbit’s diet should be hay, any of the grass hays, such as timothy, orchard grass, bermuda, meadow, oat. The second most important component is leafy greens and veggies. Some are better than others. Go to this link to read about diet and see the lists of good veggies.
https://binkybunny.com/BUNNYINFO/tabid/53/CategoryID/2/PID/940/Default.aspx

If a rabbit isn’t fed pellets, they should have a wide variety of greens each day to provide them with the vitamins they need. But if your rabbit isn’t used to having greens, you have to go very slowly and introduce just one the first week, then another the second week, etc. Romaine lettuce is a good one to start with, or some green or red leaf lettuce. Most rabbits love kale and cilantro too. You will see the lists of veggies that are good on that link.

Stop feeding the bread, potato and any grains such as wheat or corn. Give your rabbit plenty of hay – a variety of hay is good and slowly start adding greens to her diet.

My rabbit gets those when he doesn’t eat enough grass or hay (because they need the fiber). Depending on how much grass you give her, maybe she needs more. Also, patatoes aren’t good for rabbits, and I’m not sure bread is either. If you want to feed her a pellet free diet, you need a lot of variety of vegetables. She won’t get all the nutrients from grass and bread. There are websites that list how to feed them because some vegetables/plants can’t be fed all the time (like clover because it has a lot of calcium). It is quite complex and possibly expensive to feed your rabbit this way. If you really want to do this, then please look into what plants she can eat and give a variety. Otherwise, you can buy pellets that are better quality and supplement her diet with greens. When my rabbit used to go outside all day, he would barely eat any pellets. Since it’s hard to give your rabbit everything she needs with greens (unless you do a lot of research), it can be easier to give a bit of pellets with a lot of greens.

Hi and welcome to BB, Andie!
Soft poop is common in bunnies and it’s often diet-related. Rabbits should eat large amounts of low-cal, low-carb and low fat food that has lots of fiber. Grass is excellent. Grain and bread and potato and actually carrot as well are too high carb to be really good rabbit-food.

Oats can be given in smallish amounts, but I’d cut out bread and potato. Then I’d give her hay. Hay is the best food for a rabbit. A good bunny diet should consist of 80% hay. In some countries hay isn’t readily available though.

Putting a bun on a new and healthier diet should be done slowly and gradually.

Here’s a long, but really good article about intermittent soft cecotropes, ISC. Never mind the passages about diarrhea, what Natasha has is ISC, aka poopy butt.
http://rabbit.org/intermittent-soft-cecotropes-in-rabbits/

You definitely need to CHANGE the diet to proper one. Give your rabbit unlimited hay[1] (timothy is great, no alfalfa though). Buy quality pellets[2]. Reduce fresh vegetables[3] (learn which to give, in what amount and which not to give at all) in favor of hay. Start educating yourself on the topic asap. Refer to this link[4] as well.

References:

1. http://www.petsmagazine.com.sg/wellness/food/22-types-of-hay

2. http://www.therabbithouse.com/diet/rabbit-food-comparison.asp

3. http://rabbit.org/suggested-vegetables-and-fruits-for-a-rabbit-diet/

4.
https://www.naturalrabbitfood.com/can-rabbits-eat-bread/

Hi, Andi. Welcome to BB forums! I would reccomend NOT feeding your bunny potato or bread because it could cause problems if fed. I reccomend sticking to a daily scedule for food, here is mine.

8 am- Pellets. and lots and lots of timothy hay
4:30 pm-
Veggies
I feed Ben lettuce everyday and parsely every other day.
8 pm
pellets. more timothy hay

*A BUNNY SHOULD HAVE TIMOTHY HAY AVALIBLE AT ALL TIMES.