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Are you referring to crab grass?

The only save way to remove weeds from your flower beds is to hand pull.
Using mulch will help keep weeds down.
Here are some links with more information.

https://www.gardeningknowhow.com/garden-how-to/mulch/benefits-of-using-mulch.htm
https://www.gardeningknowhow.com/special/organic/using-sugar-to-kill-weeds.htm
https://www.gardeningknowhow.com/special/organic/cornmeal-in-the-garden.htm

I am assuming you are speaking of powdery mildew. Both Scotts and Bayer make "fungus fighters" but repeat applications are usually necessary. Make sure the product is rated safe for roses and follow instructions thoroughly. Make sure to clean up any plant material that falls to limit the hazard of repeat infection next year. If you use a mulch, consider removing it at the end of the growing season as it might be harboring spores. Powdery mildew usually strikes during hot, dry weather especially when roses are not getting an inch or more of water weekly. Unlike household mildew, it is not a result of humid weather. Make sure your rose is in full sun, that watering is at the root level and that you prune annually to "open up" the rose's center and improve air circulation. Early next spring, start a mildew prevention program, perhaps with Neem oil. Homemade recipes are available to treat powdery mildew but I can't confirm their effectiveness. Here is one: to one gallon of water, add 1 Tbl baking soda and 2 Tbl Safer SunSpray (fine agricultural oil) with or without anti-transpirant. (Anti-transpirant keeps fungal spores from spreading.) Coat both sides of leaves every 3 days x 3. Avoid using dish soap and kitchen oils which some recipes include.
https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-powdery-mildew.htm

See this excellent article from Gardening Know How:

https://www.gardeningknowhow.com/ornamental/flowers/roses/how-to-transplant-roses-tips-for-transplanting-a-rose-bush.htm

I researched this for quite a while but couldn't find a definitive answer so I am inclined to say they will fade. The Sunblaze collection is noted for its bright colors, and I could find some sources that said two or three of them did not fade but none said that the Yellow would not. We have an article below that lists cultivars and two specifically say they don't fade, which leads me to believe the others probably will.

https://www.gardeningknowhow.com/ornamental/flowers/roses/sunblaze-miniature-rose-bushes.htm

Digging out is just manual labor. But the first thing that occurred to me is do you know what has been sprayed on the roses in past years? There are many products and you want to know how long each persists in the soil. It isn't necessary to remove all the rose roots but do get the large ones. I would mix several inches of compost and peat in the top 2-3 inches. Plant or sow seeds then mulch with straw, shredded leaves or wood mulch. Tilling is no longer recommended. If you plant on transplanting the roses, this link will help: https://www.gardeningknowhow.com/ornamental/flowers/roses/how-to-transplant-roses-tips-for-transplanting-a-rose-bush.htm

I would wait until she has bloomed and then do a shaping pruning. If such pruning is not done a beautiful rose can become an out of control monster. Shaping pruning can be as severe as you need it to be to regain control and to thus train her into what growing habit you prefer for her. Letting such roses go for even one season can lead to some serious work needed to control the growth habit and patterns.