Can you pop her in your room rather than outside? And join her?
As far as training goes, pick up a clicker (between $2.00-$9.00) and let me know when you have one, I have a plethora of simple tricks that can be taught in one - five 5 minute sessions. Keep the clicker on you and when you have visitors work with her on those things. I also have 'games' that you can play with her that may help. You can use your voice instead, and I use a cue of "Are you ready for work" with Batty when we're about to do training, which gets his attention as he knows it means fun. If she'd rather chase things, instead of charging the clicker with food, charge it with a tennis ball (or a mini ball of some kind) being thrown. Instead of Click and Treat, Click and Throw. When you first start charging the clicker (or your voice) simply click or say the word, then give a treat or throw the ball, if you're using a ball, have two or three on hand as she may not realise at first that bringing the ball back to you means it gets thrown again.
ETA: On the subject of responsibility - When I was your age Masha, we had 15 horses, 200 cattle, 10 sheep, 2 pigs, 12 goats and 20 chickens. We also had 6 dogs and 4 cats. I was totally responsible for two dogs and 5 of the horses, plus had to take care of the exercise needs of 4 of the other horses - 6 were oldies and just liked to plod around at their own pace. I was up every morning at 2:30 or 3am, feeding, riding, grooming, releasing horses from stables, and ensuring troughs were full. I also was studying, had to be ready to get to the bus for school at 6:30am - took two hours on the bus to get to school. Afternoons were the same deal. It can be done.
I set a timetable for myself, I had a set time for tv/computing/gaming which was 30 mins a day, I usually chose between the three and rotated around. I also set myself time for chatting to friends which was 15mins. I had printed out a diary page of sorts, listing how my time was broken up and I stuck to it. I was a straight A student and passed both my HSC and SC with flying colours.
It comes down to your own time management and what you are dedicated to. If you aren't dedicated to Dora then she won't bond with you, and she will suffer.