I totally understand how you are feeling. I am seeing my T for free for two months, and it causes so much inner turmoil. I really get it. However, it sounds like she thought you were unable to go because of transportation, and so she said that's okay (because what else is someone going to say? No, that's not okay?). I really don't think you are poisoning or hurting your T by having a few free sessions. And I do think it would be really good if you told her what was going on. I think she can reassure you that things are okay and that she doesn't feel negatively towards you about this.