Reading your posting I felt as if we are identical twins...my backgroud is very similar to yours. 36, newlywed (I conceived 1 month before my weeding), stopped working just recently (which I miss terribly). You are lucky in terms of family help, one learn to truly appreciate their moms when they become one.
But enough about that, my 7 month old was sleepin about 5-7 hours a night starting when he was around six weeks old. That all stopped when he was about 5 1/2 month old. He would wake up every hour on the hour. After reading countless articles trying to figure out what was going on, I realized he was going through a milestone around six months; most infants learn to roll over and sitting unsupported around that age and I found my son practicing his new skills many times during his sleep, often waking himself up. Like you I fed him everytime but soon realized he was forming a habit, if your baby is like mine, they will gladly take the offer. I tried letting him cry it out but found it had an opposite effect, he started to view his bed time as punishment. So instead of rushing over to him as soon as he cries, I would stand by the crib, make sure he was ok and let him wait a few minutes before I go in. Graduatlely extend the wait time, when you do go in, comfort her as you normally would without feeding (cuddling and white noise helped mine). If you normally put her down after she falls asleep, wait about 20 minutes before you put her back down or until she is in a deep sleep (when her breathing becomes more slower and calmer). Another suggestion is keep a journal of the time she wakes up, if she has a pattern like my son, you will notice within a few nights. You could try to comfort her by patting her gently without picking her up righ before she is about to wake. If her teething is the cause, rub some rum on her gums (this was my doctor's advice but check with yours before you do).
Hopes this helps. Hang in there, mine started sleeping through the night again, yours will too.