No tool is inherently bad. Misuse and abusing a dog with a tool is. A lot of countries in Europe make certain tools illegal - tools that used in the right hands, are humane and effective, yet other tools that are truly more damaging (such as a "choke" or "slip" collar) are just fine... but I digress.
What you need is a GOOD BEHAVIORIST and dog trainer (preferably in one person!) to assess why the dog is behaving a certain way (many bitches going in to their first heat become intolerant of other bitches in "their" territory) and how to address is WITHOUT making it WORSE.
Often using "punishment" to try to address aggressive behavior (especially if it is an instinctive behavior) will only make it escalate.
Sounds to me that she is a little resource-aggressive - a common issue, but needs to be addressed, and I would NEVER have her off-lead (as she cannot make an appropriate choice) and I would have her muzzled to prevent a serious bite. If she's already torn clothing and gone after people, you have a problem that can end up with someone in the hospital...
You need to learn dog language so you can "see" what she is telling you in order to prevent these problems from happening! Rather than cleaning up the mess, make sure it doesn't happen in the first place!
All the best...
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