Petunia was more the frustrated. In the last four months she had slowly been relearning magic spells and charms of all kinds, trying to readjust to living around magical folk. Sometimes she would face days where she kept failing and by the end of the day it was almost as if she hadn't changed and still hated magic.
It was hard to overcome years of thinking and acting that way.
Remus had been helpful but he had long since left on a mission for Dumbledore. Harry had helped her learn some of the more simple spells that he knew by heart and even Hermione and Ron had assisted a bit. But that still didn't mean she was anywhere near efficient at anything. So what if she could levitate a feather. It owuldn't help her get a job or clean her house. So she did most of her work the old fashioned Muggle way and kept looking for a job a squib could take.
Luckily for her, she didn't need to resort to having Harry support her, though he could if she needed it. Her parents had left her a good sum of money that had never integrated into Vernon's bank accounts and she could live off that till she grew more accustomed.
She felt like a failure.
It took her by surprise when Dumbledore asked her to come to Hogwarts to become Professor Slughorn's assistant. When she had been in Hogwarts, Potions had been her favorite subject (she would later claim to her muggle friends she had majored in Chemistry. Vernon had tried to keep her from saying anything at all) and it was the one thing she had managed to do with ease and sucess.
It gave her more time to get reaccainted with her nephew and his friends. She almost cried when she met Neville Longbottom. She remembered Alice, not so much Frank, but it still saddened her to learn the girl she had once had sleepovers discussing the antics of the Mauraders and other boys with was now a near vegestable in St Mungos with her only son living the life of an orphan and being raised by his grandmother.
She somehow managed not to run into Severus Snape untill a few weeks into term when Slughorn had asked her to ask him about his course of study the previous year. The snipits she had heard from various students and her nephew had drawn a picture in her mind that she found to be lacking when she finally met the man. Yes he was slightly greasy, but not to the extent that she had been told. It just looked like he hadn't found the right shampoo yet (he really needed to...She would bet he would quite good if his hair wasn't so bad) and hadn't seen the sun or vitamins for a least a decade.