does she rent a house or an apartment?
Apartment.
does she rent a house or an apartment?
According to the Indiana Code, that is not good enough. Landlords are legally obligated to give "reasonable written or oral notice" before coming in uninvited. Pounding on the door and expecting to come in does not suffice.
Shouting LANDLORD after knocking for several minutes is reasonable oral notice in my book. The LL should be respectful of this though and it's best to just stop by and let the tenant know when you'll be by to fix things and such. Sometimes you run into tenants who refuse to answer the door, etc. and this method of entry must be used if work is to be done. I'm not going to let my houses go to crap just because you won't answer the door. If I need to do work on the place and you know it needs to be done but won't answer the door, tough, I'm coming in to do it.
Again, though, it all comes back to being considerate--both parties. LL respects tenants privacy, tenant respects LL's property and the maintenance requirements which come along with living in such a property.