Help! I Lost My Temper and Daughter Went To School In Tears

I'm a single mom. My daughter hasn't seen her dad in months because of his work and she misses him. She's been acting out a lot lately at home. Normally we get along great and are very close. We are very affectionate and normally she needs very little discipline because her behavior is usually pretty good for a little kid. She's 7. She's normally very sweet and thoughtful and tries very hard to have good behavior. But lately she's been acting out, I think because she misses her dad. She is in therapy to help her with it but right now it's not helping I guess. This morning she was in a really bad mood and had a tantrum.I lost my temper on her and yelled a lot and said she was ungrateful and a brat. I feel like the worst mom ever. I tried to apologize before I dropped her off at school but she needed space and wasn't ready to talk. She was crying but as we pulled up to drop off. I hated to say goodbye to her under such circumstances. I tried to tell her that I loved her and hoped she'd have a good day but she was not ready to say the usual "love you mom" like she normally does. It broke my heart to let her go like that. I feel so, so bad. I cried all the way home.My friends say I shouldn't try to make it up to her because that would be spoiling her but I really want to show her how sorry I am. They say that just apologizing the once is enough. But it feels like that's not good enough. Can I please get some advice? via /r/Parenting https://ift.tt/2FE7Yec