(1) in the city center near I know there are two places a Hanting chain hotel, there is a matter of the Global Times that specifically what is called do not remember, are relatively clean, and more economic 80 yuan of the room there is, more than 100 points can be lived in a very good, both are in the vicinity of the Wanda. Quite safe.
(2) buffet I do not know how much you say cheap is within the money. Here are some places, are more delicious, you pick it
1. HaoLunGuoPIZZA buffet in the seven star XinMin road mouth WangFuJing third floor 43 yuan / bit
2. Brazilian barbecue buffet in the YongJiang hotel on the first floor of Chinese food 58 yuan / bit dinner 68 yuan / bit
3. YuShiGe in the education road 50 yuan / bit
4. Jindu Hotel Buffet Restaurant at Jindu Hotel, No.17 Zhonghua Road 20 RMB/bit for morning tea and 28 RMB/bit for evening tea
5. Taoyuan Gourmet Buffet City, No.74 Taoyuan Road, Nanning, China 30/bit
6. Cadoglia Restaurant, No.125 Xinmin Road (3rd Floor, Block C, Huaxing City) 33/bit
7. Saraba Newton, No.58 Jinhu Road (Opposite to Municipal Industrial and Commercial Bureau) 55/bit
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8.Little Bridge and Flowing Water Buffet Hotpot 1F Grand Hyatt Hotel, Road End, Changhu Road 58/bit
9.Flavor Xuan, 5th Floor, Galaxy Hotel 53/bit in Galaxy Hotel, Chaoyang Road
10.Café, Jinhua Hotel 1 Dongge Road (inside Jinhua Hotel) 29 RMB/bit
11.Dark Horse Chef 25 RMB on the 3rd floor of the East Zone of the Jinyuan CBD, No.63, Jinhu Rd. /bit
Maybe now may be more expensive 10 dollars, more recommended good Lengo and Cardoria, perhaps your daughter will prefer.
(3) As for the cafe, I think the Ujima and Miro are not expensive now if you just eat. I also recommend the territory coffee, in Nanning three middle school across the back door there is a, not bad, I used to be in high school when my mom often took me there to eat 50 a few dollars we ate enough. Thousand Seek is also good. It depends on how you eat, there are expensive and cheap
I hope my answer can give you help.