How land a pool/float CNA position

Hi all. I just finished up my Junior year of nursing school. (go me!). I had to leave my CNA job a CBRF this past semester because it was way too stressful with school. I did not like the job but I asked my boss if I could pick up some hours over summer. However instead of 8 hour shifts they now have 12 hour shifts. 6-6. I am not interested in that. I explained that to my boss and I also said I don't want to work third shift. She said she has some 6 to noon, 5pm-9pm and 2pm-10pm positions. She will make a schedule and call me. So what does she do? She texts me two days later asking me to work 3rd! And I still haven't received a phone call. I don't want to work there but I do need some money to get by this summer. I think I really need to find a new job. I am looking for a job in a hospital. I really want a float/pool position because it will offer the flexibility I need to enjoy my summer break and focus on school. I am not finding any positions as a "pool/float" but I am finding 0.8 and 0.5 fte positions.

My question is, should I apply for these positions and explain in my interview I need flexibility with school and I am interested in pool/float? I want to get my foot in the door but I don't want to make myself look bad by asking that. I am hoping they will be understanding because I am a full time nursing student, going into my senior year. What do you think? Should I go ahead and apply and hope for the best? Thanks in advance.